java swing单击按钮隐藏显示JtextField的问题？

[zhangshenqiu]

java swing单击按钮隐藏显示JtextField的问题？我只能隐藏JTextfiled，但不能显示出来？急各位帮忙给点源码。

[HelloAldis]

主要问题不是setVisualable()的问题  不是显示不了 而是没地方显示

this.setLayout(new FlowLayout());//这句话吧布局设为流布局 流布局管理器默认的中间对齐与你的
                                      //setPreferredSize()大小 和 JFrame大小 有矛盾
                                       //JTextField被挡住了

//如果你点击窗口最大化就会发现出来了

把this.setLayout(new FlowLayout());
改成this.setLayout(new FlowLayout(FlowLayout.LEFT));//设置为左对齐就好le

你注册的监听器也很特别 
JComBox一般是注册
addItemLinstener 监听Item改变
addActionListener 监听被点击 

[zhuzeitou]

JTextField jtf = new JTextField();
public void actionPerformed(ActionEvent e){
jtf.setVisible(!jtf.isVisible());
}

[swandragon]

JTextField jtf = new JTextField(20);

隐藏jtf.setVisible(false);
显示jtf.setVisible(true);

[imasmallbird]

你是用JtextField.setVisible（false）设置的隐藏吧，那你可以在再次单击的时候设置
JtextField.setVisible（true）不就行了吗～～

[swandragon]

JTextField jtf = new JTextField();
boolean visible = false;
public void actionPerformed(ActionEvent e){
jtf.setVisible(visible);
visible = visible ? false : true;
}

[安小寰]

import java.awt.BorderLayout;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

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


public class DisplayText extends JFrame{
	JTextField text = new JTextField();
	JButton click = new JButton("Click");
	public DisplayText(){
		super();
		this.setSize(200, 200);
		text.setSize(100, 100);
		this.add(text);
		this.add(click,BorderLayout.SOUTH);
		click.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent e) {
				text.setVisible(!text.isVisible());
			}
			
		});
		this.setVisible(true);
	}
	
	public static void main(String[] args){
		new DisplayText();
	}
}

[zhangshenqiu]

默认是隐藏的，单击那个下拉的才显示，但为什么那样显示不了，各位帮帮忙!

public class StackUI extends JFrame{
JTextField txtfield = new JTextField("afsd");
ComboBoxModel cbxModel = new DefaultComboBoxModel();
JComboBox cbx = new JComboBox(cbxModel);
public StackUI(){
Container contentPane = this.getContentPane();
txtfield = new JTextField();
cbx.addItem("1");
cbx.addItem("2");
cbx.setPreferredSize(new Dimension(80,25));
txtfield.setPreferredSize(new Dimension(100,25));
txtfield.setVisible(false);
contentPane.add(cbx);
contentPane.add(txtfield);
initListener();
this.setLayout(new FlowLayout());
setSize(400,400);
setVisible(true);
}
public void initListener(){
cbx.addMouseListener(new MouseListener(){
public void mouseClicked(MouseEvent e) {
if(!txtfield.isVisible()){
txtfield.setVisible(true);
}
//System.out.println("afsafasdf");
}

public void mouseEntered(MouseEvent e) {
// TODO Auto-generated method stub
}
public void mouseExited(MouseEvent e) {
// TODO Auto-generated method stub

}

public void mousePressed(MouseEvent e) {
// TODO Auto-generated method stub
}

public void mouseReleased(MouseEvent e) {

}
});
cbx.addFocusListener(new FocusListener(){
public void focusGained(FocusEvent e) {
txtfield.setVisible(true);
}
public void focusLost(FocusEvent e) {

}

});

txtfield.addKeyListener(new KeyListener(){

public void keyPressed(KeyEvent e) {
if(e.getKeyChar()==e.VK_ENTER){
String txt = txtfield.getText();
boolean flag = false;
if(!txt.equals("")){
for(int i=0;i<cbxModel.getSize();i++){
if(cbxModel.getElementAt(i).equals(txt)){
flag = true;
cbxModel.setSelectedItem(txt);
break;
}
}
if(!flag){
cbx.addItem(txt);
cbxModel.setSelectedItem(txt);
}
}
}
}

public void keyReleased(KeyEvent e) {

}
public void keyTyped(KeyEvent e) {

}

});
}
public static void main(String args[]){
new StackUI();
}
}

[qingzhe2008]

public class StackUI extends JFrame {
	JTextField txtfield = new JTextField("afsd");
	ComboBoxModel cbxModel = new DefaultComboBoxModel();
	JComboBox cbx = new JComboBox(cbxModel);
	static boolean isVisible = false; //======== 1

	public StackUI() {
		Container contentPane = this.getContentPane();
//		txtfield = new JTextField(); //======== 2
		cbx.addItem("1");
		cbx.addItem("2");
		cbx.setPreferredSize(new Dimension(80, 25));
		txtfield.setPreferredSize(new Dimension(100, 25));
		contentPane.add(cbx);
		contentPane.add(txtfield);
		txtfield.setVisible(isVisible); //======== 3
		initListener();
		this.setLayout(new FlowLayout());
		setSize(400, 400);
		setVisible(true);
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}

	public void initListener() {
		//===============  4   ===================
		cbx.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent e) {
				isVisible = isVisible ? false : true;
				txtfield.setVisible(isVisible);
				StackUI.this.validate(); // ======= 重点 ======
			}
			
		});
		/**
		cbx.addMouseListener(new MouseListener() {
			public void mouseClicked(MouseEvent e) {
				if (!txtfield.isVisible()) {
					txtfield.setVisible(true);
				}
				 System.out.println("afsafasdf");
			}

			public void mouseEntered(MouseEvent e) {
				// TODO Auto-generated method stub
			}

			public void mouseExited(MouseEvent e) {
				// TODO Auto-generated method stub

			}

			public void mousePressed(MouseEvent e) {
				// TODO Auto-generated method stub
			}

			public void mouseReleased(MouseEvent e) {

			}
		});*/
		cbx.addFocusListener(new FocusListener() {
			public void focusGained(FocusEvent e) {
				txtfield.setVisible(true);
			}

			public void focusLost(FocusEvent e) {

			}

		});

		txtfield.addKeyListener(new KeyListener() {

			public void keyPressed(KeyEvent e) {
				if (e.getKeyChar() == e.VK_ENTER) {
					String txt = txtfield.getText();
					boolean flag = false;
					if (!txt.equals("")) {
						for (int i = 0; i < cbxModel.getSize(); i++) {
							if (cbxModel.getElementAt(i).equals(txt)) {
								flag = true;
								cbxModel.setSelectedItem(txt);
								break;
							}
						}
						if (!flag) {
							cbx.addItem(txt);
							cbxModel.setSelectedItem(txt);
						}
					}
				}
			}

			public void keyReleased(KeyEvent e) {

			}

			public void keyTyped(KeyEvent e) {

			}

		});
	}

	public static void main(String args[]) {
		new StackUI();
	}
}