JAVA编写的计算器小程序

package WL07153; import java.awt.*; import java.awt.event.*; public class WL07网络153戴必凯Sy2 extends WindowAdapter { Panel p1 = new Panel(); Panel p2 = new Panel(); Panel p3 = new Panel(); // 将面板分为三部分 TextField txt; private Button[] b = new Button[17]; private String ss[] = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2", "3", "*", "0", "/", "=", "C", "关闭" }; // 设置按钮 static double a; static String s, str; public static void main(String args[]) { (new WL07网络153戴必凯Sy2()).frame(); } public void frame() { Frame fm = new Frame(""); for (int i = 0; i <= 16; i++) { b[i] = new Button(ss[i]); } for (int i = 0; i <= 15; i++) { p2.add(b[i]); } b[16].setBackground(Color.blue); // 设置“关闭”背景色 txt = new TextField(15); txt.setEditable(false); for (int i = 0; i <= 16; i++) { b[i].addActionListener(new buttonlistener()); // 设置事件监听 } 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)); // 设置按钮排列 p3.setLayout(new BorderLayout()); p3.add(b[16]); fm.add(p1, "North"); fm.add(p2, "Center"); fm.add(p3, "South"); // 面板布局 fm.pack(); fm.show(); } public void windowClosing(WindowEvent e) { System.exit(0);// 关闭窗口 } class buttonlistener implements ActionListener { 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() == "C") txt.setText(""); } } public void jisuan() { if (s == "+") a += Double.parseDouble(txt.getText()); else if (s == "-") a -= Double.parseDouble(txt.getText()); else if (s == "*") a *= Double.parseDouble(txt.getText()); else if (s == "/") a /= Double.parseDouble(txt.getText()); else a = Double.parseDouble(txt.getText()); } } } class close implements ActionListener { public void actionPerformed(ActionEvent e) { System.exit(0);// 关闭窗口 } }