计算器如何实现键盘输入？（附计算器代码）

TheRealBo 2011-05-24 01:14:39
想在以下计算器实现键盘输入，应该怎么写？


public class Calculator extends JFrame implements ActionListener {

	

	// 定义计算器显示框

	public JTextField jtf, jtf2;

	// 定义0-9按键

	public Btn btnE, btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8,

			btn9, btnP, btnM, btnX, btnD, C, btnPO, btnA;

	// 定义数字面板,操作符面板

	public JPanel numP, numP1, numP2, showP, opP, opP1, opP2;

	// 定义计算的中间变量

	static double num1, num2, num3, result;

	// 定义操作符

	char opPerator;

	boolean next = false;

	static boolean flagE = false;// 监督是否按了等号

	static boolean isDot = false;// 监督是否按了小数点

	static String s = "=", str1, str2, newS, oldS;// 定义变量 创建对像

	// TextField txt;

	// UndoManager um=new UndoManager();

	public JMenuBar jmb;

	public JMenu jm;

	private JMenuItem SCal, Cal, Exit;



	public Calculator() {

		

		super("普通计算器");

		// 布局

		setSize(480, 357);// setSize(309, 345);

		setLocation(700, 100);

		Container c = this.getContentPane();

		BorderLayout bL = new BorderLayout();

		c.setLayout(bL);

		jmb = new JMenuBar();

		setJMenuBar(jmb);

		SCal = new JMenuItem("科学计算器");

		Cal = new JMenuItem("普通计算器");

		Exit = new JMenuItem("退出(Q)");

		Exit.setMnemonic('Q');

		Exit.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent event) {

				System.exit(0);

			}

		});

		jm = new JMenu("编辑");

		jm.add(Cal);

		jm.add(SCal);

		jm.add(Exit);

		jmb.add(jm);

		showP = new JPanel();

		opP = new JPanel();

		opP1 = new JPanel();

		opP2 = new JPanel();

		numP = new JPanel();

		numP1 = new JPanel();

		numP2 = new JPanel();



		showP.setLayout(new BorderLayout());

		opP.setLayout(new BorderLayout());

		opP1.setLayout(new GridLayout(3, 2, 2, 2));

		opP2.setLayout(new BorderLayout());

		numP.setLayout(new BorderLayout());

		numP1.setLayout(new GridLayout(3, 3, 2, 2));

		numP2.setLayout(new GridLayout(1, 2, 2, 2));

		Font font = new Font("New Roma Times", Font.BOLD, 30);



		jtf2 = new JTextField("0");

		jtf = new JTextField("0");

		jtf.setFont(font);

		jtf.setEditable(false);//jtf设置不可编辑

		jtf2.setEditable(false);

		

		showP.add(jtf2, BorderLayout.NORTH);

		showP.add(jtf, BorderLayout.CENTER);

		jtf2.setHorizontalAlignment(jtf2.RIGHT);

		jtf.setHorizontalAlignment(jtf.RIGHT);

		c.add(showP, BorderLayout.NORTH);

		

	         	 /************创建对象***********/

		

		btn9 = new Btn("9");

		btn8 = new Btn("8");

		btn7 = new Btn("7");

		btn6 = new Btn("6");

		btn5 = new Btn("5");

		btn4 = new Btn("4");

		btn3 = new Btn("3");

		btn2 = new Btn("2");

		btn1 = new Btn("1");

		btn0 = new Btn("0");

		btnPO = new Btn(".");

		C = new Btn("C");

		btnA = new Btn("←");

		btnP = new Btn("+");

		btnM = new Btn("-");

		btnX = new Btn("*");

		btnD = new Btn("/");

		btnE = new Btn("=");

		

		         /************设置按钮外观*********/

		

		btn9.setFont(font);

		btn9.setForeground(Color.white);

		btn8.setFont(font);

		btn8.setForeground(Color.white);

		btn6.setFont(font);

		btn6.setForeground(Color.white);

		btn7.setFont(font);

		btn7.setForeground(Color.white);

		btn5.setFont(font);

		btn5.setForeground(Color.white);

		btn4.setFont(font);

		btn4.setForeground(Color.white);

		btn3.setFont(font);

		btn3.setForeground(Color.white);

		btn2.setFont(font);

		btn2.setForeground(Color.white);

		btn1.setFont(font);

		btn1.setForeground(Color.white);

		btn0.setFont(font);

		btn0.setForeground(Color.white);

		btnPO.setFont(font);

		btnPO.setForeground(Color.cyan);

		C.setFont(font);

		C.setForeground(Color.cyan);

		btnA.setFont(font);

		btnA.setForeground(Color.cyan);

		btnP.setFont(font);

		btnP.setForeground(Color.cyan);

		btnM.setFont(font);

		btnM.setForeground(Color.cyan);

		btnX.setFont(font);

		btnX.setForeground(Color.cyan);

		btnD.setFont(font);

		btnD.setForeground(Color.cyan);

		btnE.setFont(font);

		btnE.setForeground(Color.cyan);

		btnE.setEnabled(false);

		

		           /************按钮添加到面板***************/

		

		numP1.add(btn7);

		numP1.add(btn8);

		numP1.add(btn9);

		numP1.add(btn4);

		numP1.add(btn5);

		numP1.add(btn6);

		numP1.add(btn1);

		numP1.add(btn2);

		numP1.add(btn3);

		numP.add(numP1, BorderLayout.NORTH);//1-9

		

		numP2.add(btn0);//0

		numP2.add(btnPO);//小数点

		numP.add(numP2, BorderLayout.SOUTH);

		

		c.add(numP, BorderLayout.WEST);

		

		opP1.add(C);//复原 

		opP1.add(btnA);//撤消

		opP1.add(btnP);//加号

		opP1.add(btnM);//减号

		opP1.add(btnX);//乘号

		opP1.add(btnD);//除号

		opP.add(opP1, BorderLayout.NORTH);

		

		opP2.add(btnE);//等号

		opP.add(opP2, BorderLayout.SOUTH);

		

		c.add(opP, BorderLayout.EAST);

		this.setResizable(false);

		

		

		

		/************添加监听器*******************/

		

		btn0.addActionListener(this);

		btn1.addActionListener(this);

		btn2.addActionListener(this);

		btn3.addActionListener(this);

		btn4.addActionListener(this);

		btn5.addActionListener(this);

		btn6.addActionListener(this);

		btn7.addActionListener(this);

		btn8.addActionListener(this);

		btn9.addActionListener(this);

		btnP.addActionListener(this);

		btnM.addActionListener(this);

		btnX.addActionListener(this);

		btnD.addActionListener(this);

		btnE.addActionListener(this);

		btnPO.addActionListener(this);

		btnA.addActionListener(this);

		C.addActionListener(this);

		SCal.addActionListener(this);

	}



	public void actionPerformed(ActionEvent e) {

//代码太长发不了，这里就不加入了

		}

｝
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TheRealBo 2011-05-25
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行了，谢谢:)
qybao 2011-05-25
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因为你是在构造函数中让JTestField获得焦点，而实际上此时JFrame还没有显示，一旦JFrame显示的时候，焦点又会回到JFrame上，最简单的方法就是
在构造函数的最后
setVisible(true); //显示JFrame
requestFocus(false); //JFrame放弃焦点
jtf.requestFocus();//JTestField获得焦点
或者实现WindowListener接口
public void windowActivated(WindowEvent e) {}
public void windowClosed(WindowEvent e) {}
public void windowClosing(WindowEvent e) {}
public void windowDeactivated(WindowEvent e) {}
public void windowDeiconified(WindowEvent e) {}
public void windowIconified(WindowEvent e) {}
public void windowOpened(WindowEvent e) {jtf.requestFocus();} //在窗体显示后让JTextField获得焦点
构造函数里
addWindowListener(this);

在你的代码上修改

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;

import java.awt.event.WindowListener;







import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JTextField;





public class Calculator extends JFrame implements ActionListener,KeyListener {

    // 定义计算器显示框

    public JTextField jtf, jtf2;

    // 定义0-9按键

    public Btn btnE, btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8,

            btn9, btnP, btnM, btnX, btnD, C, btnPO, btnA;

    // 定义数字面板,操作符面板

    public JPanel numP, numP1, numP2, showP, opP, opP1, opP2;

    // 定义计算的中间变量

    static double num1, num2, num3, result;

    // 定义操作符

    char opPerator;

    boolean next = false;

    static boolean flagE = false;// 监督是否按了等号

    static boolean isDot = false;// 监督是否按了小数点

    static String s = "=", str1, str2, newS, oldS;// 定义变量 创建对像

    // TextField txt;

    // UndoManager um=new UndoManager();

    public JMenuBar jmb;

    public JMenu jm;

    private JMenuItem SCal, Cal, Exit;



    public Calculator() {

        super("普通计算器");

        // 布局

        setSize(490, 365);// setSize(309, 345);

        setLocation(700, 100);

        Container c = this.getContentPane();

        BorderLayout bL = new BorderLayout();

        c.setLayout(bL);

        jmb = new JMenuBar();

        setJMenuBar(jmb);

        SCal = new JMenuItem("科学计算器");

        Cal = new JMenuItem("普通计算器");

        Exit = new JMenuItem("退出(Q)");

        Exit.setMnemonic('Q');

        Exit.addActionListener(new ActionListener() {

            public void actionPerformed(ActionEvent event) {

                System.exit(0);

            }

        });

        jm = new JMenu("编辑");

        jm.add(Cal);

        jm.add(SCal);

        jm.add(Exit);

        jmb.add(jm);

        showP = new JPanel();

        opP = new JPanel();

        opP1 = new JPanel();

        opP2 = new JPanel();

        numP = new JPanel();

        numP1 = new JPanel();

        numP2 = new JPanel();



        showP.setLayout(new BorderLayout());

        opP.setLayout(new BorderLayout());

        opP1.setLayout(new GridLayout(3, 2, 2, 2));

        opP2.setLayout(new BorderLayout());

        numP.setLayout(new BorderLayout());

        numP1.setLayout(new GridLayout(3, 3, 2, 2));

        numP2.setLayout(new GridLayout(1, 2, 2, 2));

        Font font = new Font("New Roma Times", Font.BOLD, 30);



        jtf2 = new JTextField("0");

        jtf = new JTextField("0");

        jtf.setFont(font);

        jtf.setEditable(false);

        jtf2.setEditable(false);

        //jtf.requestFocus();

        

        showP.add(jtf2, BorderLayout.NORTH);

        showP.add(jtf, BorderLayout.CENTER);

        jtf2.setHorizontalAlignment(jtf2.RIGHT);

        jtf.setHorizontalAlignment(jtf.RIGHT);

        

        c.add(showP, BorderLayout.NORTH);

        

                  /************创建对象***********/

        

        btn9 = new Btn("9");

        btn8 = new Btn("8");

        btn7 = new Btn("7");

        btn6 = new Btn("6");

        btn5 = new Btn("5");

        btn4 = new Btn("4");

        btn3 = new Btn("3");

        btn2 = new Btn("2");

        btn1 = new Btn("1");

        btn0 = new Btn("0");

        btnPO = new Btn(".");

        C = new Btn("C");

        btnA = new Btn("←");

        btnP = new Btn("+");

        btnM = new Btn("-");

        btnX = new Btn("*");

        btnD = new Btn("/");

        btnE = new Btn("=");

        

                 /************设置按钮外观*********/

        

        btn9.setFont(font);

        btn9.setForeground(Color.white);

        btn8.setFont(font);

        btn8.setForeground(Color.white);

        btn6.setFont(font);

        btn6.setForeground(Color.white);

        btn7.setFont(font);

        btn7.setForeground(Color.white);

        btn5.setFont(font);

        btn5.setForeground(Color.white);

        btn4.setFont(font);

        btn4.setForeground(Color.white);

        btn3.setFont(font);

        btn3.setForeground(Color.white);

        btn2.setFont(font);

        btn2.setForeground(Color.white);

        btn1.setFont(font);

        btn1.setForeground(Color.white);

        //btn1.setRequestFocusEnabled(false);//lost focus so that text can have a keylistener

        btn0.setFont(font);

        btn0.setForeground(Color.white);

        btnPO.setFont(font);

        btnPO.setForeground(Color.cyan);

        C.setFont(font);

        C.setForeground(Color.cyan);

        btnA.setFont(font);

        btnA.setForeground(Color.cyan);

        btnP.setFont(font);

        btnP.setForeground(Color.cyan);

        btnM.setFont(font);

        btnM.setForeground(Color.cyan);

        btnX.setFont(font);

        btnX.setForeground(Color.cyan);

        btnD.setFont(font);

        btnD.setForeground(Color.cyan);

        btnE.setFont(font);

        btnE.setForeground(Color.cyan);

        btnE.setEnabled(false);

        

        

        jtf.requestFocus();

                

                   /************按钮添加到面板***************/

        

        numP1.add(btn7);

        numP1.add(btn8);

        numP1.add(btn9);

        numP1.add(btn4);

        numP1.add(btn5);

        numP1.add(btn6);

        numP1.add(btn1);

        numP1.add(btn2);

        numP1.add(btn3);

        numP.add(numP1, BorderLayout.NORTH);//1-9

        

        numP2.add(btn0);//0

        numP2.add(btnPO);//小数点

        numP.add(numP2, BorderLayout.SOUTH);

        

        c.add(numP, BorderLayout.WEST);

        

        opP1.add(C);//复原 

        opP1.add(btnA);//撤消

        opP1.add(btnP);//加号

        opP1.add(btnM);//减号

        opP1.add(btnX);//乘号

        opP1.add(btnD);//除号

        opP.add(opP1, BorderLayout.NORTH);

        

        opP2.add(btnE);//等号

        opP.add(opP2, BorderLayout.SOUTH);

        

        c.add(opP, BorderLayout.EAST);

        

        

        /************添加监听器*******************/

        //btn0.addKeyListener((KeyListener) this);

        btn0.addActionListener(this);

        btn1.addActionListener(this);

        btn2.addActionListener(this);

        btn3.addActionListener(this);

        btn4.addActionListener(this);

        btn5.addActionListener(this);

        btn6.addActionListener(this);

        btn7.addActionListener(this);

        btn8.addActionListener(this);

        btn9.addActionListener(this);

        btnP.addActionListener(this);

        btnM.addActionListener(this);

        btnX.addActionListener(this);

        btnD.addActionListener(this);

        btnE.addActionListener(this);

        btnPO.addActionListener(this);

        btnA.addActionListener(this);

        C.addActionListener(this);

        SCal.addActionListener(this);

        /***************/

        jtf.addKeyListener(this);

        

        addWindowListener(this); //添加事件监听

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 

        setVisible(true); //显示窗体

        //requestFocus(false); //简单的做法是显示窗体后设置焦点

        //jtf.requestFocus();

        

    }





    public void actionPerformed(ActionEvent e) {

                        

    }

    /****************************/

    

    public void keyTyped(KeyEvent e){

        

        char x=e.getKeyChar();

        if(x>='0'&&x<='9'){

            jtf.setText(jtf.getText()+String.valueOf(x));

        }



        



    }

    @Override

    public void keyPressed(KeyEvent e) {

        

            }



    @Override

    public void keyReleased(KeyEvent e) {

        // TODO Auto-generated method stub



    }



    public void windowActivated(WindowEvent e) {}

    public void windowClosed(WindowEvent e) {}

    public void windowClosing(WindowEvent e) {}

    public void windowDeactivated(WindowEvent e) {}

    public void windowDeiconified(WindowEvent e) {}

    public void windowIconified(WindowEvent e) {}

    public void windowOpened(WindowEvent e) {jtf.requestFocus();} //或者在窗体显示在事件里让JTextField获得焦点



    public static void main(String[] args) {new Calculator();} //测试



}
TheRealBo 2011-05-24
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参考了网上的，自己修改了一下，代码如下。但是还是不行，得单击JTestField才能从键盘输入
package com.jluzh.javaex90;



import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.KeyListener;





import javax.swing.JFrame;

import javax.swing.JMenu;

import javax.swing.JMenuBar;

import javax.swing.JMenuItem;

import javax.swing.JPanel;

import javax.swing.JTextField;





public class Calculator extends JFrame implements ActionListener,KeyListener {

	// 定义计算器显示框

	public JTextField jtf, jtf2;

	// 定义0-9按键

	public Btn btnE, btn0, btn1, btn2, btn3, btn4, btn5, btn6, btn7, btn8,

			btn9, btnP, btnM, btnX, btnD, C, btnPO, btnA;

	// 定义数字面板,操作符面板

	public JPanel numP, numP1, numP2, showP, opP, opP1, opP2;

	// 定义计算的中间变量

	static double num1, num2, num3, result;

	// 定义操作符

	char opPerator;

	boolean next = false;

	static boolean flagE = false;// 监督是否按了等号

	static boolean isDot = false;// 监督是否按了小数点

	static String s = "=", str1, str2, newS, oldS;// 定义变量 创建对像

	// TextField txt;

	// UndoManager um=new UndoManager();

	public JMenuBar jmb;

	public JMenu jm;

	private JMenuItem SCal, Cal, Exit;



	public Calculator() {

		super("普通计算器");

		// 布局

		setSize(490, 365);// setSize(309, 345);

		setLocation(700, 100);

		Container c = this.getContentPane();

		BorderLayout bL = new BorderLayout();

		c.setLayout(bL);

		jmb = new JMenuBar();

		setJMenuBar(jmb);

		SCal = new JMenuItem("科学计算器");

		Cal = new JMenuItem("普通计算器");

		Exit = new JMenuItem("退出(Q)");

		Exit.setMnemonic('Q');

		Exit.addActionListener(new ActionListener() {

			public void actionPerformed(ActionEvent event) {

				System.exit(0);

			}

		});

		jm = new JMenu("编辑");

		jm.add(Cal);

		jm.add(SCal);

		jm.add(Exit);

		jmb.add(jm);

		showP = new JPanel();

		opP = new JPanel();

		opP1 = new JPanel();

		opP2 = new JPanel();

		numP = new JPanel();

		numP1 = new JPanel();

		numP2 = new JPanel();



		showP.setLayout(new BorderLayout());

		opP.setLayout(new BorderLayout());

		opP1.setLayout(new GridLayout(3, 2, 2, 2));

		opP2.setLayout(new BorderLayout());

		numP.setLayout(new BorderLayout());

		numP1.setLayout(new GridLayout(3, 3, 2, 2));

		numP2.setLayout(new GridLayout(1, 2, 2, 2));

		Font font = new Font("New Roma Times", Font.BOLD, 30);



		jtf2 = new JTextField("0");

		jtf = new JTextField("0");

		jtf.setFont(font);

		jtf.setEditable(false);

		jtf2.setEditable(false);

		//jtf.requestFocus();

		

		showP.add(jtf2, BorderLayout.NORTH);

		showP.add(jtf, BorderLayout.CENTER);

		jtf2.setHorizontalAlignment(jtf2.RIGHT);

		jtf.setHorizontalAlignment(jtf.RIGHT);

		

		c.add(showP, BorderLayout.NORTH);

		

	         	 /************创建对象***********/

		

		btn9 = new Btn("9");

		btn8 = new Btn("8");

		btn7 = new Btn("7");

		btn6 = new Btn("6");

		btn5 = new Btn("5");

		btn4 = new Btn("4");

		btn3 = new Btn("3");

		btn2 = new Btn("2");

		btn1 = new Btn("1");

		btn0 = new Btn("0");

		btnPO = new Btn(".");

		C = new Btn("C");

		btnA = new Btn("←");

		btnP = new Btn("+");

		btnM = new Btn("-");

		btnX = new Btn("*");

		btnD = new Btn("/");

		btnE = new Btn("=");

		

		         /************设置按钮外观*********/

		

		btn9.setFont(font);

		btn9.setForeground(Color.white);

		btn8.setFont(font);

		btn8.setForeground(Color.white);

		btn6.setFont(font);

		btn6.setForeground(Color.white);

		btn7.setFont(font);

		btn7.setForeground(Color.white);

		btn5.setFont(font);

		btn5.setForeground(Color.white);

		btn4.setFont(font);

		btn4.setForeground(Color.white);

		btn3.setFont(font);

		btn3.setForeground(Color.white);

		btn2.setFont(font);

		btn2.setForeground(Color.white);

		btn1.setFont(font);

		btn1.setForeground(Color.white);

		//btn1.setRequestFocusEnabled(false);//lost focus so that text can have a keylistener

		btn0.setFont(font);

		btn0.setForeground(Color.white);

		btnPO.setFont(font);

		btnPO.setForeground(Color.cyan);

		C.setFont(font);

		C.setForeground(Color.cyan);

		btnA.setFont(font);

		btnA.setForeground(Color.cyan);

		btnP.setFont(font);

		btnP.setForeground(Color.cyan);

		btnM.setFont(font);

		btnM.setForeground(Color.cyan);

		btnX.setFont(font);

		btnX.setForeground(Color.cyan);

		btnD.setFont(font);

		btnD.setForeground(Color.cyan);

		btnE.setFont(font);

		btnE.setForeground(Color.cyan);

		btnE.setEnabled(false);

		

		

		jtf.requestFocus();

				

		           /************按钮添加到面板***************/

		

		numP1.add(btn7);

		numP1.add(btn8);

		numP1.add(btn9);

		numP1.add(btn4);

		numP1.add(btn5);

		numP1.add(btn6);

		numP1.add(btn1);

		numP1.add(btn2);

		numP1.add(btn3);

		numP.add(numP1, BorderLayout.NORTH);//1-9

		

		numP2.add(btn0);//0

		numP2.add(btnPO);//小数点

		numP.add(numP2, BorderLayout.SOUTH);

		

		c.add(numP, BorderLayout.WEST);

		

		opP1.add(C);//复原 

		opP1.add(btnA);//撤消

		opP1.add(btnP);//加号

		opP1.add(btnM);//减号

		opP1.add(btnX);//乘号

		opP1.add(btnD);//除号

		opP.add(opP1, BorderLayout.NORTH);

		

		opP2.add(btnE);//等号

		opP.add(opP2, BorderLayout.SOUTH);

		

		c.add(opP, BorderLayout.EAST);

		

		

		/************添加监听器*******************/

		//btn0.addKeyListener((KeyListener) this);

		btn0.addActionListener(this);

		btn1.addActionListener(this);

		btn2.addActionListener(this);

		btn3.addActionListener(this);

		btn4.addActionListener(this);

		btn5.addActionListener(this);

		btn6.addActionListener(this);

		btn7.addActionListener(this);

		btn8.addActionListener(this);

		btn9.addActionListener(this);

		btnP.addActionListener(this);

		btnM.addActionListener(this);

		btnX.addActionListener(this);

		btnD.addActionListener(this);

		btnE.addActionListener(this);

		btnPO.addActionListener(this);

		btnA.addActionListener(this);

		C.addActionListener(this);

		SCal.addActionListener(this);

		/***************/

		jtf.addKeyListener(this);

		

		

	}





	public void actionPerformed(ActionEvent e) {

						

	}

	/****************************/

	

	public void keyTyped(KeyEvent e){

		

		char x=e.getKeyChar();

		if(x>='0'&&x<='9'){

			jtf.setText(jtf.getText()+String.valueOf(x));

		}



        



	}

	@Override

	public void keyPressed(KeyEvent e) {

		

			}



	@Override

	public void keyReleased(KeyEvent e) {

		// TODO Auto-generated method stub



	}



}
TheRealBo 2011-05-24
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