Question

java swing 单击窗口或者按钮出现一个矩形

作业是给一个conways game of life加上GUI 一直以为很简单。。但是快到期末才发现SWING好难 完全搞不懂、、用swing的UI创建WINDOW或者直接写代码完全不运行。。自己也完全不知道该干什么了。。。求助。。只要把画矩形搞明白后面就可以自己摸索了 拜托了！ 下面的是看了一些帖子后自己弄出来的。。用SWING design创建的程序一直提醒空指针。。如果可以的话求+qq解答。。。752824100
package exer1;

import java.awt.Graphics;

public class Main {

public static void main(String[] args) {
Initialise ini = new Initialise();
ini.frame.setBounds(0, 0, 800, 600);
ini.create();
ini.panel.repaint();

ini.frame.setVisible(true);
}

}
package exer1;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Initialise implements MouseListener {
JFrame frame = new JFrame();
JPanel panel = new JPanel();
Graphics e=null;
public void create() {

panel.setBounds(0, 0, 800,600);

frame.add(panel);

}
public void paint(Graphics g){

g.setColor(Color.BLACK);
g.fillRect(0, 0, 40, 40);

}
@Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub

}
@Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub

}
@Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub

}
@Override
public void mousePressed(MouseEvent arg0) {
panel.repaint();

}
@Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub

}
}

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Answer 1

这个是学习看看吧!!

public class test9 extends ApplicationFrame {
	public test9(String title) {
		super(title);
		key = (int)(Math.random() * 100);
		initComponents();
		this.pack();
		this.setVisible(true);
		this.setLocationRelativeTo(null);
	}
	int start=0;
	int end=100;
	int key=50;
	public static void main(String[]args){
		new test9("猜数字");
	}
	
	private void initComponents() {
		// TODO 自动产生的方法 Stub
		jPanel1 = new javax.swing.JPanel();
		jPanel1.setPreferredSize(new Dimension(250,150));
		add(jPanel1);
		jPanel1.setLayout(null);
		
		jLabel1 = new javax.swing.JLabel();
		jTextField1 = new javax.swing.JTextField();
		jButton1 = new javax.swing.JButton();
		jButton2 = new javax.swing.JButton();
		
		jLabel1.setText("猜数字游戏:0~100");
		jLabel1.setHorizontalAlignment(javax.swing.JTextField.LEFT);
		jLabel1.setSize(120, 20);
		jLabel1.setLocation(10, 10);
		jPanel1.add(jLabel1);
		
		jTextField1.setFont(new java.awt.Font("新细明体", 1, 12));
		jTextField1.setSize(100, 20);
		jTextField1.setLocation(20, 40);
		jTextField1.enableInputMethods(false);
		jPanel1.add(jTextField1);
		
		jButton1.setText("确定");
		jButton1.setFont(new java.awt.Font("新细明体", 1, 14));
		jButton1.addActionListener(new java.awt.event.ActionListener() {
			public void actionPerformed(java.awt.event.ActionEvent evt) {
					jButtonActionPerformed(evt);
			}
			private void jButtonActionPerformed(ActionEvent evt) {
				try{
				Numberguess(Integer.parseInt(jTextField1.getText()));
				jTextField1.setText("");
				} catch(Exception e) {
					new Thread(new Runnable() {//跳出提示框
						public void run() {
							JOptionPane.showMessageDialog(null, "请输入整数。");
						}
					}).start();
				}
			}
		});
		jButton1.setSize(100, 20);
		jButton1.setLocation(10, 80);
		jPanel1.add(jButton1);
		
		jButton2.setText("重新开始");
		jButton2.setFont(new java.awt.Font("新细明体", 1, 14));
		jButton2.addActionListener(new java.awt.event.ActionListener() {
			public void actionPerformed(java.awt.event.ActionEvent evt) {
					jButtonActionPerformed(evt);
			}
			private void jButtonActionPerformed(ActionEvent evt) {
				jTextField1.setText("");
				jLabel1.setText("猜数字游戏:0~100");
				key = (int)(Math.random() * 100);
				start=0;
				end=100;
			}
		});
		jButton2.setSize(100, 20);
		jButton2.setLocation(120, 80);
		jPanel1.add(jButton2);
	}
	
	
	public void Numberguess(int i){
		if(i==key){
			jLabel1.setText("恭喜你答对了!");
		}else if(i<key && start<i){
			start=i;
			jLabel1.setText("猜数字游戏:"+start+"~"+end);
		}else if(i>key && i<end){
			end=i;
			jLabel1.setText("猜数字游戏:"+start+"~"+end);
		}else{
			new Thread(new Runnable() {//跳出提示框
				public void run() {
					JOptionPane.showMessageDialog(null, "输入范围超过。");
				}
			}).start();
		}
		
	}
	private javax.swing.JPanel jPanel1;
	private javax.swing.JLabel jLabel1;
	private javax.swing.JButton jButton1;
	private javax.swing.JButton jButton2;
	private javax.swing.JTextField jTextField1;
}

Answer 2

已经加你QQ给你传了代码·october