Question

java GUI 运行显示不出结果~~谢谢..

代码：

import java.awt.*;
import java.awt.event.ActionListener;
import javax.faces.event.ActionEvent;
import javax.swing.*;

public class Chatroom extends JFrame implements ActionListener {

TextArea Area= new TextArea();
BorderLayout borderlayout1 = new BorderLayout();
JPanel panel1=new JPanel();
GridLayout gridlayout1 = new GridLayout();
JLabel Lab1=new JLabel();
JTextField tf1= new JTextField(10);
JLabel Lab2=new JLabel();
JPanel panel2=new JPanel();
FlowLayout flowlayout1 = new FlowLayout();
JButton send=new JButton();
JButton exit=new JButton();

public void crFrame(){

this.setSize(200, 200);
send.addActionListener(this);
exit.addActionListener(this);
this.getContentPane().add(panel1,BorderLayout.CENTER);
tf1.setText("");
Lab2 = new JLabel("要说的话");
Lab2.setHorizontalAlignment(SwingConstants.CENTER);
panel2.setLayout(flowlayout1);
send = new JButton("发送");
exit = new JButton("退出");
panel1.add(Lab1);
Lab1.setHorizontalAlignment(SwingConstants.CENTER);
panel1.add(Area);
panel1.add(Lab2);
panel1.add(tf1);
this.getContentPane().add(panel2,BorderLayout.CENTER);
panel2.add(send);
panel2.add(exit);
Lab1 = new JLabel("聊天内容");
panel1.setLayout(gridlayout1);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}

public void actionPerformed(ActionEvent e){
if(e.getSource()==exit)
System.exit(0);
else if(e.getSource()==send){
String str="tom说："+tf1.getText().trim();
tf1.setText("");
System.out.println(str);
Area.setText(Area.getText()+str+'\n');
}
}
public static void main(String[] args){

new Chatroom().crFrame();

}

public void actionPerformed(java.awt.event.ActionEvent e) {
// TODO Auto-generated method stub

}
}

我运行的界面是这样的：

Answer 1

/**

 *备注：将panel1的布局方式改为BoxLayout，fix了一些其他细节，可参考，并附上运行后的图片。

 */

import java.awt.BorderLayout;

import java.awt.FlowLayout;

import java.awt.Font;

import java.awt.GridLayout;

import java.awt.Rectangle;

import java.awt.TextArea;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.BoxLayout;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

import javax.swing.UIManager;

public class Chatroom extends JFrame implements ActionListener {

TextArea Area = new TextArea();

BorderLayout borderlayout1 = new BorderLayout();

JPanel panel1 = new JPanel();

GridLayout gridlayout1 = new GridLayout(2, 2);

JLabel Lab1 = new JLabel();

JTextField tf1 = new JTextField(10);

JLabel Lab2 = new JLabel();

JPanel panel2 = new JPanel();

FlowLayout flowlayout1 = new FlowLayout();

JButton send = new JButton();

JButton exit = new JButton();

public void crFrame() {

// this.setSize(200, 300);

this.setTitle("Chatroom");

send = new JButton("发送");

exit = new JButton("退出");

send.addActionListener(this);

exit.addActionListener(this);

tf1.setText("");

tf1.setBounds(new Rectangle(0, 0, 150, 120));

Lab2 = new JLabel("要说的话");

Lab2.setHorizontalAlignment(SwingConstants.CENTER);

// panel1.setLayout(gridlayout1);

panel1.setLayout(new BoxLayout(panel1,BoxLayout.Y_AXIS));

panel2.setLayout(flowlayout1);

Lab1 = new JLabel("聊天内容");

Lab1.setHorizontalAlignment(SwingConstants.CENTER);

panel1.add(Lab1);

panel1.add(Area);

panel1.add(Lab2);

panel1.add(tf1);

panel2.add(send);

panel2.add(exit);

this.getContentPane().add(panel1, BorderLayout.NORTH);

this.getContentPane().add(panel2, BorderLayout.CENTER);

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.pack();

this.setVisible(true);

}

public void actionPerformed(ActionEvent e) {

if (e.getSource() == exit)

System.exit(0);

else if (e.getSource() == send) {

String str = "tom说：" + tf1.getText().trim();

tf1.setText("");

System.out.println(str);

Area.setText(Area.getText() + str + '\n');

}

}

public static void main(String[] args) {

try {

UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");

} catch (Exception e) {

e.printStackTrace();

}

new Chatroom().crFrame();

}

}

Answer 2

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
import javax.*;
public class Chatroom extends JFrame implements ActionListener {

TextArea Area= new TextArea(30,30);
BorderLayout borderlayout1 = new BorderLayout();
JPanel panel1=new JPanel();
GridLayout gridlayout1 = new GridLayout();
JLabel Lab1=new JLabel();
JTextField tf1= new JTextField(10);
JLabel Lab2=new JLabel();
JPanel panel2=new JPanel();
FlowLayout flowlayout1 = new FlowLayout();
JButton send=new JButton();
JButton exit=new JButton();

public void crFrame(){

this.setSize(200, 200);
send.addActionListener(this);
exit.addActionListener(this);
this.getContentPane().add(panel1,BorderLayout.CENTER);
tf1.setText("");
Lab2 = new JLabel("要说的话");
Lab2.setHorizontalAlignment(SwingConstants.CENTER);
panel2.setLayout(flowlayout1);
send = new JButton("发送");
exit = new JButton("退出");
panel1.add(Lab1);
//Lab1.setHorizontalAlignment(SwingConstants.CENTER);
panel1.add(Area);
panel1.add(Lab2);
panel1.add(tf1);
//this.getContentPane().add(panel2,BorderLayout.CENTER);
panel2.add(send);
panel2.add(exit);
Lab1 = new JLabel("聊天内容");
panel1.setLayout(gridlayout1);
this.getContentPane().add(panel1,BorderLayout.WEST);
this.getContentPane().add(panel2,BorderLayout.EAST);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
}

public void actionPerformed(ActionEvent e){
if(e.getSource()==exit)
System.exit(0);
else if(e.getSource()==send){
String str="tom说："+tf1.getText().trim();
tf1.setText("");
System.out.println(str);
Area.setText(Area.getText()+str+'\n');
}
}
public static void main(String[] args){

new Chatroom().crFrame();

}

/*public void actionPerformed(java.awt.event.ActionEvent e) {
// TODO Auto-generated method stub

}*/
}

你的问题是因为你的两个panel之间一个挡住了另外一个，而且我现在帮你显示的界面布局还是很难看，只是帮你解决了只能显示一个panel的问题，推荐你看看关于布局的内容，相信你肯定会设计出好看的界面

Answer 3

加个pack()

Answer 4

你怎么不试试绝对布局呢，绝对布局虽然麻烦点，但是显示效果还是不错的