简易计算器-3.doc

简计算器 import java.awt.*; import java.awt.event.*; public class j001 extends WindowAdapter { Panel p1 = new Panel(); Panel p2 = new Panel(); Panel p3 = new Panel(); TextField txt; private Button[] b = new Button[17]; private String ss[] = { 7, 8, 9, +, 4, 5, 6, -, 1, 2, 3, *, 清空, 0, =, /, 关闭 }; static double a; static String s, str;//定义变量 创建对像 public static void main(String args[]) { (new j001()).frame(); } public void frame() { Frame fm = new Frame(简单计算器); for (int i = 0; i = 16; i++) { b[i] = new Button(ss[i]); } for (int i = 0; i = 15; i++) { p2.add(b[i]); } //创建按钮 并添加到P2 b[16].setBackground(Color.yellow); txt = new TextField(15); txt.setEditable(false); for (int i = 0; i = 16; i++) { b[i].addActionListener(new buttonlistener());//添加监听器 } b[16].addActionListener(new close()); fm.addWindowListener(this); fm.setBackground(Color.red); p1.setLayout(new BorderLayout()); p1.add(txt, North); p2.setLayout(new GridLayout(4, 4)); p3.setLayout(new BorderLayout()); p3.add(b[16]); fm.add(p1, North); fm.add(p2, Center); fm.add(p3, South); fm.pack(); fm.setVisible(true);//都是些窗中设置 添加相关组件和监听器 } public void windowClosing(WindowEvent e) { System.exit(0);//退出系统 } class buttonlistener implements ActionListener {//编写监听器事件 通过按键得出给果 public void actionPerformed(ActionEvent e) { Button btn = (Button) e.getSource(); if (btn.getLabel() == =) { jisuan(); str = String.valueOf(a); txt.setText(str); s = ; } else if (btn.getLabel() == +) { jisuan(); txt.setText(); s = +; } else if (btn.getLabel() == -) { jisuan(); txt.setText(); s = -; } else if (btn.getLabel() == /) { jisuan(); txt.setText(); s = /; } else if (btn.getLabel() == *) { jisuan(); txt.setText(); s = *; } else { txt.setText(txt.getText() + btn.getLabel()); if (btn.getLabel() == 清空) txt.setText(); } } public void jisuan() {//编写具体计算方法 if (s == +) a += Double.p