JFrame简单使用

1.

import java.awt.Color;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import javax.swing.JFrame;

public class MyFrame {

	public static void main(String[] args) {
		JFrame frame = new JFrame("我的第一个Frame");
		frame.setSize(500 , 1000);
		frame.getContentPane().setBackground(Color.RED);
		frame.setVisible(true);
		
		BufferedReader intemp = new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Press return key to exit.");
		try{
			String s = intemp.readLine();
		} catch(IOException e){
			System.out.println("IOException");
		}
		
		System.exit(0);
		
	
	}//main 结束

}

2.

import java.awt.Color;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

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

public class FrameWithPanelTest {

	public static void main(String[] args) {
		JFrame frame = new JFrame("My Frame");
		frame.setSize(500 , 500);
		frame.getContentPane().setBackground(Color.BLACK);
		frame.setVisible(true);
		
		JPanel contentPane = new JPanel();
		contentPane.setSize(100 , 100);
		contentPane.setBackground(Color.yellow);
		frame.add(contentPane);
		frame.setLayout(null); //不加上这一句设置布局，contentPanel会铺满整个frame
		
		BufferedReader intemp = new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Press return key to exit.");
		try{
			String s = intemp.readLine();
		} catch(IOException e){
			System.out.println("IOException");
		}
		System.exit(0);
		
		
		
	}

}

3.

import java.awt.Color;
import java.awt.FlowLayout;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

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

public class FrameWithPanelTest {

	public static void main(String[] args) {
		JFrame frame = new JFrame("My Frame");
		frame.setSize(500 , 500);
		frame.getContentPane().setBackground(Color.BLACK);
		frame.setLayout(new FlowLayout(FlowLayout.CENTER , 50 , 50)); //为JFrame顶层容器设置FlowLayout布局管理器
		
		
		JPanel contentPane = new JPanel();
		contentPane.setSize(100 , 100);
		//内部按钮对齐方式，水平和垂直间距
		contentPane.setLayout(new FlowLayout(FlowLayout.CENTER , 50 , 50)); //为Japnel设置布局管理器
		contentPane.setBackground(Color.yellow);

		JButton btn1 , btn2 , btn3 ; //定义3个按钮
		btn1 = new JButton("打开");
		btn2 = new JButton("关闭");
		btn3 = new JButton("返回");
		contentPane.add(btn1);
		contentPane.add(btn2);
		contentPane.add(btn3);
		
		frame.add(contentPane);
		frame.setVisible(true); //显示JFrame
		
		
		BufferedReader intemp = new BufferedReader(new InputStreamReader(System.in));
		System.out.println("Press return key to exit.");
		try{
			String s = intemp.readLine();
		} catch(IOException e){
			System.out.println("IOException");
		}
		System.exit(0);
		
		
		
	}

}

4.在上面代码加入下列语句

contentPane.add(new JLabel()); //空标签站位用
contentPane.add(new JLabel()); //空标签站位用
contentPane.add(new JLabel()); //空标签站位用

5.鼠标按键测试代码

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;

import javax.swing.JFrame;
import javax.swing.JLabel;

//鼠标及按键
public class MouseControl implements MouseMotionListener , KeyListener{
	private JFrame frame;
	private JLabel tf;
	String ch = ""; //放置待显示的字符
	
	public static void main(String[] args){
		MouseControl two = new MouseControl();
		two.go();
	}
	
	
	private void go() {
		frame = new JFrame("鼠标按键测试");
		Container contentPane = frame.getContentPane();
		contentPane.add(new JLabel("get mouse and keyboard event") , BorderLayout.NORTH);
		tf = new JLabel();
		contentPane.add(tf, BorderLayout.SOUTH);
		//注册监听程序
		frame.addMouseMotionListener(this);
		frame.addKeyListener(this);
		
		frame.setSize(300 , 300);
		frame.setVisible(true);
		
	}


	//接下来为实现接口中的方法
	@Override
	public void keyTyped(KeyEvent e) { //顺序 keypress keytype keyrelease
		// TODO Auto-generated method stub
		System.out.println("2");
		int charcode = e.getKeyCode();
		ch = "有键按下2";
		if(charcode == KeyEvent.VK_SHIFT) {ch = "shift2";}
		if(charcode == KeyEvent.VK_CONTROL) ch = "control2";
	}

	@Override
	public void keyPressed(KeyEvent e) { //看不到显示，因为keytype覆盖了
		// TODO Auto-generated method stub
		System.out.println("1");
		int charcode = e.getKeyCode();
		ch = "有键按下1";
		if(charcode == KeyEvent.VK_SHIFT) ch = "shift1";
		if(charcode == KeyEvent.VK_CONTROL) ch = "control1";
	}

	@Override
	public void keyReleased(KeyEvent e) {
		// TODO Auto-generated method stub
		//ch = "有键松开";
		System.out.println("3");
	}

	@Override
	public void mouseDragged(MouseEvent e) { //按住鼠标拖动才会调用
		// TODO Auto-generated method stub
		String s = "鼠标拖动的坐标: X =" +e.getX() + " Y =" + e.getY() + " KEY：" + ch;
		tf.setText(s);
	}

	@Override
	public void mouseMoved(MouseEvent e) {
		// TODO Auto-generated method stub
		String s = "鼠标移动时的坐标: X =" +e.getX() + " Y =" + e.getY() + " KEY：" + ch;
		tf.setText(s);
	}
	
}