郝斌_GUI

85事件处理

import java.awt.Button;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class A implements ActionListener {
	public void actionPerformed(ActionEvent e) {
		System.out.println("hello");
	}
}

public class Test {
	public static void main(String[] args) {

		Frame f = new Frame("haha");
		Button bn = new Button("ok");
		f.add(bn);
		A aa = new A();

		bn.addActionListener(aa);

		f.pack();
		f.setVisible(true);

		// 适配器，设置窗体可以关闭
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}
}

87十个按钮的设计

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class Test {
	public static void main(String[] args) {
		Frame f = new Frame();
		f.setSize(300, 300);
		f.setLayout(new GridLayout(2, 1));// 2行1列

		Panel p1 = new Panel();
		p1.setLayout(new BorderLayout());
		Panel p1_1 = new Panel();
		p1_1.setLayout(new GridLayout(2, 1));// 2行1列
		Button bn1 = new Button("BUTTON1");
		Button bn2 = new Button("BUTTON2");
		Button bn3 = new Button("BUTTON3");
		Button bn4 = new Button("BUTTON4");
		p1.add(bn1, BorderLayout.WEST);
		p1_1.add(bn3);
		p1_1.add(bn4);
		p1.add(p1_1, BorderLayout.CENTER);
		p1.add(bn2, BorderLayout.EAST);

		Panel p2 = new Panel();
		p2.setLayout(new BorderLayout());
		Panel p2_1 = new Panel();
		p2_1.setLayout(new GridLayout(2, 2));// 2行2列
		Button bn5 = new Button("BUTTON5");
		Button bn6 = new Button("BUTTON6");
		Button bn7 = new Button("BUTTON7");
		Button bn8 = new Button("BUTTON8");
		Button bn9 = new Button("BUTTON9");
		Button bn10 = new Button("BUTTON10");
		p2.add(bn5, BorderLayout.WEST);
		p2_1.add(bn7);
		p2_1.add(bn8);
		p2_1.add(bn9);
		p2_1.add(bn10);
		p2.add(p2_1, BorderLayout.CENTER);
		p2.add(bn6, BorderLayout.EAST);

		f.add(p1);
		f.add(p2);
		f.pack();
		f.setVisible(true);

		// 适配器，设置窗体可以关闭
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}
}

88三个文本框的相加运算示例

89内部类 匿名类

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Label;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class TF {
	public static TextField tf1, tf2, tf3;

	public void launch() {
		Frame f = new Frame();
		tf1 = new TextField(30);
		tf2 = new TextField(30);
		tf3 = new TextField(30);
		Button bn = new Button("=");
		Label lb = new Label("+");

		f.setLayout(new FlowLayout());
		f.add(tf1);
		f.add(lb);
		f.add(tf2);
		f.add(bn);
		f.add(tf3);

		bn.addActionListener(new MyMoniter());

		f.pack();
		f.setVisible(true);

		// 适配器，设置窗体可以关闭
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}

	class MyMoniter implements ActionListener {
		@Override
		public void actionPerformed(ActionEvent e) {
			int num1 = Integer.parseInt(tf1.getText());
			int num2 = Integer.parseInt(tf2.getText());
			int num3 = num1 + num2;

			Integer it = new Integer(num3);
			String str3 = it.toString();

			tf3.setText(str3);
		}
	}
}

public class Test {
	public static void main(String[] args) {
		new TF().launch();
	}
}