小程序：加法计算器

[alan4050]

你们好，这个计算器我用MyEclipse编译没有错误，但是运行的时候算不了加法，大家能帮我看看吗，谢谢了！
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class calculator extends JPanel implements ActionListener{
JButton bt1,bt2,bt3,bt4,bt5,bt6,bt7,bt8,bt9,bt0;
JButton addbutton;
JButton reset;
JButton equalbutton;
JTextField result;
int flag =0,calresult;
Integer rt,rs;
String current; //当前值
String tem; //显示屏上的值
StringBuffer number;
public calculator( ) {
rt = new Integer(0);
rs =new Integer(0);
number =new StringBuffer( );
result = new JTextField(8);
result.setHorizontalAlignment(JTextField.RIGHT);
bt1 =new JButton("1");
bt1.addActionListener(this);
bt2 =new JButton("2");
bt2.addActionListener(this);
bt3 =new JButton("3");
bt3.addActionListener(this);
bt4 =new JButton("4");
bt4.addActionListener(this);
bt5 =new JButton("5");
bt5.addActionListener(this);
bt6 =new JButton("6");
bt6.addActionListener(this);
bt7 =new JButton("7");
bt7.addActionListener(this);
bt8 =new JButton("8");
bt8.addActionListener(this);
bt9 =new JButton("9");
bt9.addActionListener(this);
bt0 =new JButton("0");
bt0.addActionListener(this);
addbutton=new JButton("+");
addbutton.addActionListener(this);
reset = new JButton("reset");
reset.addActionListener(this);
setLayout(new BorderLayout(20,20));
add(result,BorderLayout.NORTH);
JPanel numberpanel=new JPanel();
numberpanel.setLayout(new GridLayout(4,3,5,5));
numberpanel.add(bt1);
numberpanel.add(bt2);
numberpanel.add(bt3);
numberpanel.add(bt4);
numberpanel.add(bt5);
numberpanel.add(bt6);
numberpanel.add(bt7);
numberpanel.add(bt8);
numberpanel.add(bt9);
numberpanel.add(bt0);
numberpanel.add(addbutton);
add(numberpanel,BorderLayout.CENTER);
JPanel controlpanel=new JPanel( );
controlpanel.setLayout(new GridLayout(1,2));
controlpanel.add(reset);
equalbutton=new JButton("=");
equalbutton.addActionListener(this);
equalbutton.setEnabled(false);
controlpanel.add(equalbutton);
add(controlpanel,BorderLayout.SOUTH);
}
public void actionPerformed(ActionEvent evt){
Object source =evt.getSource();
if(source == bt1)number.append("1");
else if (source == bt2)number.append("2");
else if (source == bt3)number.append("3");
else if (source == bt4)number.append("4");
else if (source == bt5)number.append("5");
else if (source ==bt6)number.append("6");
else if (source ==bt7)number.append("7");
else if (source ==bt8)number.append("8");
else if (source ==bt9)number.append("9");
else if (source ==bt0)number.append("0");
result.setText(number.toString());
if(flag ==0)
{current = number.toString();
equalbutton.setEnabled(false);
}
if(flag == 1)
{
tem=number.toString();
equalbutton.setEnabled(true);
}
if(source == addbutton)
{flag = 1;number=new StringBuffer();
equalbutton.setEnabled(false);}
if(source == equalbutton)
{
rs=Integer.valueOf(tem);
rt=Integer.valueOf("");
if(flag== 1)
calresult=rt.intValue()+rs.intValue();
result.setText(String.valueOf(calresult));
flag=0;
equalbutton.setEnabled(false);
number=new StringBuffer();
}
if(source == reset)
{number = new StringBuffer();
equalbutton.setEnabled(false);
flag=0;
}
}
public static void main(String set[ ]){
JFrame count = new JFrame("计算器");
count.addWindowListener(new WindowAdapter( ){
public void windowClosing(WindowEvent e){
System.exit(0);
}
});
calculator cou =new calculator( );
count.getContentPane( ).add(cou);
count.setSize(200,200);
count.setVisible(true);
}
}

[alan4050]

大家可以帮帮忙吗？

[lacus87]

不知道楼主你的业务逻辑

设一个可输入的布尔值
最好每次点击+的时候
1、获得屏幕上当前的值
2、把当前值加在后台值上
3、把后台值显示出来。
4、设置可输入为true，
下次点击数字的时候，判断FALSE就直接加在当前文本后面，为true就先清空再往里面加并设成flase，

[kiss601459202]

if(source == equalbutton)
{
rs=Integer.valueOf(tem);
rt=Integer.valueOf("");

这里把""换成current 就行了 ""转int 格式转换错误了

[bayougeng]

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Calculator extends JPanel implements ActionListener {
	JButton bt1, bt2, bt3, bt4, bt5, bt6, bt7, bt8, bt9, bt0;

	JButton addbutton;

	JButton reset;

	JButton equalbutton;

	JTextField result;

	int flag = 0, calresult;

	Integer rt, rs;

	String current; // 当前值

	String tem; // 显示屏上的值

	StringBuffer number;

	public Calculator() {
		rt = new Integer(0);
		rs = new Integer(0);
		number = new StringBuffer();
		result = new JTextField(8);
		result.setHorizontalAlignment(JTextField.RIGHT);
		bt1 = new JButton("1");
		bt1.addActionListener(this);
		bt2 = new JButton("2");
		bt2.addActionListener(this);
		bt3 = new JButton("3");
		bt3.addActionListener(this);
		bt4 = new JButton("4");
		bt4.addActionListener(this);
		bt5 = new JButton("5");
		bt5.addActionListener(this);
		bt6 = new JButton("6");
		bt6.addActionListener(this);
		bt7 = new JButton("7");
		bt7.addActionListener(this);
		bt8 = new JButton("8");
		bt8.addActionListener(this);
		bt9 = new JButton("9");
		bt9.addActionListener(this);
		bt0 = new JButton("0");
		bt0.addActionListener(this);
		addbutton = new JButton("+");
		addbutton.addActionListener(this);
		reset = new JButton("reset");
		reset.addActionListener(this);
		setLayout(new BorderLayout(20, 20));
		add(result, BorderLayout.NORTH);
		JPanel numberpanel = new JPanel();
		numberpanel.setLayout(new GridLayout(4, 3, 5, 5));
		numberpanel.add(bt1);
		numberpanel.add(bt2);
		numberpanel.add(bt3);
		numberpanel.add(bt4);
		numberpanel.add(bt5);
		numberpanel.add(bt6);
		numberpanel.add(bt7);
		numberpanel.add(bt8);
		numberpanel.add(bt9);
		numberpanel.add(bt0);
		numberpanel.add(addbutton);
		add(numberpanel, BorderLayout.CENTER);
		JPanel controlpanel = new JPanel();
		controlpanel.setLayout(new GridLayout(1, 2));
		controlpanel.add(reset);
		equalbutton = new JButton("=");
		equalbutton.addActionListener(this);
		equalbutton.setEnabled(false);
		controlpanel.add(equalbutton);
		add(controlpanel, BorderLayout.SOUTH);
	}

	public void actionPerformed(ActionEvent evt) {
		Object source = evt.getSource();
		if (source == bt1)
			number.append("1");
		else if (source == bt2)
			number.append("2");
		else if (source == bt3)
			number.append("3");
		else if (source == bt4)
			number.append("4");
		else if (source == bt5)
			number.append("5");
		else if (source == bt6)
			number.append("6");
		else if (source == bt7)
			number.append("7");
		else if (source == bt8)
			number.append("8");
		else if (source == bt9)
			number.append("9");
		else if (source == bt0)
			number.append("0");
		result.setText(number.toString());
		if (flag == 0) {
			current = number.toString();
			equalbutton.setEnabled(false);
		}
		if (flag == 1) {
			tem = number.toString();
			equalbutton.setEnabled(true);
		}
		if (source == addbutton) {
			flag = 1;
			rt += Integer.valueOf(number.toString());
			number = new StringBuffer();
			equalbutton.setEnabled(false);
		}
		if (source == equalbutton) {
			rs = Integer.valueOf(tem);
			if (flag == 1)
				calresult = rt.intValue() + rs.intValue();
			result.setText(String.valueOf(calresult));
			flag = 0;
			equalbutton.setEnabled(false);
			number = new StringBuffer();
		}
		if (source == reset) {
			number = new StringBuffer();
			equalbutton.setEnabled(false);
			flag = 0;
		}
	}

	public static void main(String set[]) {
		JFrame count = new JFrame("计算器");
		count.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		Calculator cou = new Calculator();
		count.getContentPane().add(cou);
		count.setSize(200, 200);
		count.setVisible(true);
	}
}

可以算一下了。
很多地方需要完善。

[coooliang]

做这个啥用哦~~

[faiken]

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