Java计算器源代码(已成功运行).docx

Java 计算器程序代码以下为代码：import javax.swing.*;import java.awt.*;import java.awt.event.*;public class Calculator extends JFrame implements ActionListener private boolean dotExist, operated, equaled; / 帮助运算的布尔变量 private double storedNumber; / 目前的结果 private char lastOperator; / 表示上一运算符 private JTextField operation; / 结果栏 private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; /运算符 private JButton numbers; / 数字 / 构造者 public Calculator() setTitle(Calculator); / 初始化变量 dotExist = false; / 表示当前的数是否有小数点 operated = false; / 表示任意运算符是否被按下 equaled = false; / 表示等号是否被按下 storedNumber = 0; lastOperator = ?; / 初始化窗口变量 operation = new JTextField(0); operation.setEditable(false); numbers = new JButton10; for (int i = 0; i 10; i+) numbersi = new JButton( + i); dot = new JButton(.); plus = new JButton(+); minus = new JButton(-); multi = new JButton(*); div = new JButton(/); sqrt = new JButton(); equal = new JButton(=); changePN = new JButton(); clear = new JButton(AC); / 将窗口物体放入窗口 GridBagLayout layout = new GridBagLayout(); getContentPane().setLayout(layout); addComponent(layout, operation, 0, 0, 4, 1); addComponent(layout, numbers1, 1, 0, 1, 1); addComponent(layout, numbers2, 1, 1, 1, 1); addComponent(layout, numbers3, 1, 2, 1, 1); addComponent(layout, numbers4, 2, 0, 1, 1); addComponent(layout, numbers5, 2, 1, 1, 1); addComponent(layout, numbers6, 2, 2, 1, 1); addComponent(layout, numbers7, 3, 0, 1, 1); addComponent(layout, numbers8, 3, 1, 1, 1); addComponent(layout, numbers9, 3, 2, 1, 1); addComponent(layout, dot, 4, 0, 1, 1); addComponent(layout, numbers0, 4, 1, 1, 1); addComponent(layout, sqrt, 4, 2, 1, 1); addComponent(layout, plus, 1, 3, 1, 1); addComponent(layout, minus, 2, 3, 1, 1); addComponent(layout, multi, 3, 3, 1, 1); addComponent(layout, div, 4, 3, 1, 1); addComponent(layout, equal, 5, 0, 2, 1); addComponent(layout, changePN, 5, 2, 1, 1); addComponent(layout, clear, 5, 3, 1, 1); / 对按钮进行反应的方法 public void actionPerformed(ActionEvent e) JButton btn = (JButton)e.getSource(); if (btn = clear) operation.setText(0); dotExist = false; storedNumber = 0; lastOperator = ?; else if (btn = equal) operate(=); equaled = true; else if (btn = plus) operate(+); equaled = false; else if (btn = minus) operate(-); equaled = false; else if (btn = multi) operate(*); equaled = false; else if (btn = div) operate(/); equaled = false; else if (btn = changePN) operate(p); operate(=); equaled = true; else if (btn = sqrt) operate(s); operate(=); equaled = true; else if (equaled) storedNumber = 0; for (int i = 0; i 10; i+) if (btn = numbersi) if (operation.getText().equals(0) operation.setText( + i); else if(! operated) operation.setText(operation.getText() + i); else operation.setText( + i); operated = false; if (btn = dot & ! dotExist) operation.setText(operation.getText() + .); dotExist = true; / 进行运算的方法 private void operate(char operator) double currentNumber = Double.valueOf(operation.getText().doubleValue(); if (lastOperator = ?) storedNumber = currentNumber; else if (lastOperator = +) storedNumber += currentNumber; else if (lastOperator = -) storedNumber -= currentNumber; else if (lastOperator = *) storedNumber *= currentNumber; else if (lastOperator = /) storedNumber /= currentNumber; else if (lastOperator = p) storedNumber *= -1; else if (lastOperator = s) storedNumber = Math.sqrt(currentNumber); else if (lastOperator = = & equaled) storedNumber = currentNumber; operation.setText( + storedNumber); operated = true; lastOperator = operator; / 快捷使用GridBagLayout的方法 private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height) GridBagConstraints constraints = new GridBagConstraints(); constraints.fill = GridBagConstraints.BOTH; constraints.insets = new Insets(10, 2, 10, 2); constraints.weightx = 100; constraints.weighty = 100; constraints.gridx = col; constraints.gridy = row; constraints.gridwidth = width; constraints.gridheight = height; layout.setConstraints(component, constraints); if (component instanceof JButton) (