基于JavaEE技术的全栈开发学习资源汇总

import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Calculator extends JFrame { // 输入框，显示当前输入的数字或结果 private JTextField textField; // 数字0-9及小数点按钮 private JButton button0, button1, button2, button3, button4, button5, button6, button7, button8, button9, buttonDot; // 加减乘除按钮 private JButton buttonPlus, buttonMinus, buttonMultiply, buttonDivide; // 操作（等于、清空、删除）按钮 private JButton buttonEqual, buttonClear, buttonDelete; // 平方、立方、乘方、n次方、开平方、开n次方、倒数按钮 private JButton buttonSquare, buttonCube, buttonPower, buttonNthPow, buttonRoot, buttonNthRoot, buttonReciprocal; // 三角函数、反三角函数按钮 private JButton buttonSin, buttonCos, buttonTan, buttonAsin, buttonAcos, buttonAtan; // 当前操作 private Operation currentOperation; // 当前值 private int currentValue; // 枚举操作类型 private enum Operation { ADDITION, SUBTRACTION, MULTIPLICATION, DIVISION, POWER, NTHROOT } public Calculator() { initComponents(); initListeners(); } /** * 初始化组件 */ private void initComponents() { setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); setTitle("Calculator"); // 使用GridBagLayout布局方式 GridBagLayout layout = new GridBagLayout(); setLayout(layout); // 初始化输入框 textField = new JTextField(); GridBagConstraints constraints = new GridBagConstraints(); constraints.gridx = 0; constraints.gridy = 0; constraints.gridwidth = 6; // 扩展6列 constraints.fill = GridBagConstraints.BOTH; add(textField, constraints); // 初始化数字、小数点按钮 button7 = new JButton("7"); button8 = new JButton("8"); button9 = new JButton("9"); button4 = new JButton("4"); button5 = new JButton("5"); button6 = new JButton("6"); button1 = new JButton("1"); button2 = new JButton("2"); button3 = new JButton("3"); button0 = new JButton("0"); buttonDot = new JButton("."); addButton(constraints, button7, 0, 1); addButton(constraints, button8, 1, 1); addButton(constraints, button9, 2, 1); addButton(constraints, button4, 0, 2); addButton(constraints, button5, 1, 2); addButton(constraints, button6, 2, 2); addButton(constraints, button1, 0, 3); addButton(constraints, button2, 1, 3); addButton(constraints, button3, 2, 3); addButton(constraints, button0, 0, 4); addButton(constraints, buttonDot, 1, 4); // 初始化平方、立方、乘方、n次方、开平方、开n次方、倒数按钮 buttonSquare = new JButton("x²"); buttonCube = new JButton("x³"); buttonPower = new JButton("x^y"); buttonNthPow = new JButton("x^n"); buttonRoot = new JButton("√x"); buttonNthRoot = new JButton("n√x"); buttonReciprocal = new JButton("1/x"); addButton(constraints, buttonSquare, 3, 1); addButton(constraints, buttonCube, 4, 1); addButton(constraints, buttonPower, 5, 1); addButton(constraints, buttonNthPow, 3, 2); addButton(constraints, buttonRoot, 4, 2); addButton(constraints, buttonNthRoot, 5, 2); addButton(constraints, buttonReciprocal, 5, 3); // 初始化加减乘除按钮 buttonPlus = new JButton("+"); buttonMinus = new JButton("-"); buttonMultiply = new JButton("×"); buttonDivide = new JButton("÷"); addButton(constraints, buttonPlus, 3, 3); addButton(constraints, buttonMinus, 4, 3); addButton(constraints, buttonMultiply, 3, 4); addButton(constraints, buttonDivide, 4, 4); // 初始化操作（等于、清空、删除）按钮 buttonEqual = new JButton("="); buttonClear = new JButton("C"); buttonDelete = new JButton("DEL"); constraints.gridwidth = 2; addButton(constraints, buttonEqual, 5, 4); constraints.gridx = 3; addButton(constraints, buttonClear, 0, 5); constraints.gridx = 4; addButton(constraints, buttonDelete, 1, 5); // 初始化三角函数、反三角函数按钮 buttonSin = new JButton("sin"); buttonCos = new JButton("cos"); buttonTan = new JButton("tan"); buttonAsin = new JButton("asin"); buttonAcos = new JButton("acos"); buttonAtan = new JButton("atan"); addButton(constraints, buttonSin, 0, 6); addButton(constraints, buttonCos, 1, 6); addButton(constraints, buttonTan, 2, 6); addButton(constraints, buttonAsin, 3, 6); addButton(constraints, buttonAcos, 4, 6); addButton(constraints, buttonAtan, 5, 6); pack(); } /** * 添加按钮 */ private void addButton(GridBagConstraints constraints, JButton button, int x, int y) { constraints.gridx = x; constraints.gridy = y; constraints.gridwidth = 1; add(button, constraints); } /** * 初始化各个按钮的监听器 */ private void initListeners() { // 数字0-9、小数点按钮监听器 ActionListener numberListener = new ActionListener() { @Override public void actionPerformed(ActionEvent e) { String textValue = textField.getText(); textValue += ((JButton)e.getSource()).getText(); textField.setText(textValue); } }; button0.addActionListener(numberListener); button1.addActionListener(numberListener); button2.addActionListener(numberListener); button3.addActionListener(numberListener); button4.addActionListener(numberListener); button5.addActionListener(numberListener); button6.addActionListener(numberListener); button7.addActionListener(numberListener); button8.addActionListener(numberListener); button9.addActionListener(numberListener); buttonDot.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { if (!textField.getText().contains(".")) { String textValue = textField.getText(); textValue += "."; textField.setText(textValue); } } }); // 平方、立方、乘方、n次方、开平方、开n次方、倒数按钮监听器 ActionListener operationListener = new ActionListener() { @Override public void actionPerformed(ActionEvent e) { double value = Double.parseDouble(textField.getText()); switch (((JButton)e.getSource()).getText()) { case "x²": textField.setText(Double.toString(Math.pow(value, 2))); break; case "x³": textField.setText(Double.toString(Math.pow(value, 3))); break; case "x^y": currentValue = (int)Math.round(value); currentOperation = Operation.POWER; textField.setText(""); break; case "x^n": currentValue = (int)Math.round(value); currentOperation = Operation.NTHROOT; textField.setText(""); break; case "n√x": currentValue = (int)Math.round(value); currentOperation = Operation.NTHROOT