java swing带GUI界面的计算器系统源码.zip

import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.math.BigDecimal; import java.math.MathContext; import java.math.RoundingMode; import javax.swing.*; public class panelCommon extends JPanel implements ActionListener { JButton button1, button2, button3, button4, button5, button6, button7, button8, button9, button0, buttonJia, buttonJian, buttonCheng, buttonChu, buttonDeng, buttonDian, buttonC, buttonDel, buttonZF, buttonGH; JTextField jtf; CalWin calwin; char oper; String key, allKey = "1234567890.±del", jjccKey = "+-*/"; BigDecimal d1, d2; boolean first; public panelCommon(CalWin cw) { calwin = cw; jtf = new JTextField(18); jtf.setHorizontalAlignment(JTextField.RIGHT); jtf.setEditable(false); jtf.setBackground(new Color(255, 255, 255)); jtf.setText("0"); this.add(jtf); button1 = new JButton("1"); button2 = new JButton("2"); button3 = new JButton("3"); button4 = new JButton("4"); button5 = new JButton("5"); button6 = new JButton("6"); button7 = new JButton("7"); button8 = new JButton("8"); button9 = new JButton("9"); button0 = new JButton("0"); buttonJia = new JButton("+"); buttonJian = new JButton("-"); buttonCheng = new JButton("*"); buttonChu = new JButton("/"); buttonDeng = new JButton("="); buttonDian = new JButton("."); buttonDel = new JButton("del"); buttonC = new JButton("c"); buttonZF = new JButton("±"); buttonGH = new JButton("√"); this.add(buttonDel); this.add(buttonC); this.add(buttonZF); this.add(buttonGH); this.add(button1); this.add(button2); this.add(button3); this.add(buttonJia); this.add(button4); this.add(button5); this.add(button6); this.add(buttonJian); this.add(button7); this.add(button8); this.add(button9); this.add(buttonCheng); this.add(button0); this.add(buttonDian); this.add(buttonDeng); this.add(buttonChu); buttonDel.addActionListener(this); buttonC.addActionListener(this); buttonZF.addActionListener(this); buttonGH.addActionListener(this); button1.addActionListener(this); button2.addActionListener(this); button3.addActionListener(this); button4.addActionListener(this); button5.addActionListener(this); button6.addActionListener(this); button7.addActionListener(this); button8.addActionListener(this); button9.addActionListener(this); button0.addActionListener(this); buttonJia.addActionListener(this); buttonJian.addActionListener(this); buttonCheng.addActionListener(this); buttonChu.addActionListener(this); buttonDeng.addActionListener(this); buttonDian.addActionListener(this); init(); } public void actionPerformed(ActionEvent e) { JButton b = (JButton) e.getSource(); if (b == buttonDian) { if (this.jtf.getText().indexOf(".") > 0) calwin.cal.move(); else jtf.setText(jtf.getText() + "."); if (first) { d2 = d1 = getNum(); } else { d2 = getNum(); } } else if (b == buttonZF) { BigDecimal d = getNum(); d = new BigDecimal("0").subtract(d); setFormatNum(d); if (first) { d2 = d1 = getNum(); } else { d2 = getNum(); } } else if (b == buttonDel) { if (jtf.getText().length() == 1 || jtf.getText().length() == 2 && jtf.getText().startsWith("-")) { jtf.setText("0"); } else { String s = jtf.getText(); s = s.substring(0, s.length() - 1); if (s.endsWith("E+") || s.endsWith("E-")) s = s.substring(0, s.length() - 2); jtf.setText(s); if (first) { d2 = d1 = getNum(); } else { d2 = getNum(); } } } else if (b == buttonC) { init(); } else if (b == buttonJia) { BigDecimal s; if (!first && allKey.indexOf(key) >= 0) { if (oper == '-' || oper == '/') { s = operate(d1, oper, d2); } else { s = operate(d2, oper, d1); } setFormatNum(s); }// 如果不是第一次，且上一次操作是对数字进行操作 else { first = false; } d2 = d1 = getNum(); // System.out.print("111我执行啦\n"); oper = '+'; } else if (b == buttonJian) { BigDecimal s; if (!first && allKey.indexOf(key) >= 0) { s = operate(d1, oper, d2); setFormatNum(s); }// 如果不是第一次，且上一次操作是对数字进行操作 else { first = false; } d2 = d1 = getNum(); oper = '-'; } else if (b == buttonCheng) { BigDecimal s; if (!first && allKey.indexOf(key) >= 0) { if (oper == '-' || oper == '/') { s = operate(d1, oper, d2); } else { s = operate(d2, oper, d1); } setFormatNum(s); }// 如果不是第一次，且上一次操作是对数字进行操作 else { first = false; } d2 = d1 = getNum(); oper = '*'; } else if (b == buttonChu) { BigDecimal s; if (!first && allKey.indexOf(key) >= 0) { s = operate(d1, oper, d2); setFormatNum(s); }// 如果不是第一次，且上一次操作是对数字进行操作 else { first = false; } d2 = d1 = getNum(); oper = '/'; } else if (b == buttonGH) { if (jtf.getText().startsWith("-")) { calwin.cal.move(); init(); return; } BigDecimal d = getNum(); MathContext mc = new MathContext(10, RoundingMode.HALF_DOWN); d = new BigDecimal(Math.sqrt(d.doubleValue()), mc); setFormatNum(d); if (first) { d2 = d1 = getNum(); } else { d2 = getNum(); } } else if (b == buttonDeng) { BigDecimal s = null; d2 = getNum(); if (!key.equals("=")) { s = operate(d1, oper, d2); } else { s = operate(d2, oper, d1); } if (oper != '=' && !key.equals("=")) {// 上一次操作为 +-*/ d1 = getNum(); } setFormatNum(s); first = true; } else { if (this.jtf.getText().equals("0") || allKey.indexOf(key) == -1 ) { this.jtf.setText(b.getText()); } else { this.jtf.setText(jtf.getText() + b.getText()); } if (first) { d2 = d1 = getNum(); } else { d2 = getNum(); }// d2作被加数:d2+d1 } key = b.getText(); // System.out.println(d1.toString()+" "+d2.toString()); } public BigDecimal getNum() { BigDecimal d = new BigDecimal(jtf.getText()); return d; } public void setFormatNum(BigDecimal dd) { MathContext mc = new MathContext(18, RoundingMode.HALF_DOWN); BigDecimal d = new BigDecimal(dd.toString(), mc); String num = d.toString(); if (num.endsWith(".0")) num = num.replaceAll("\\.0", ""); this.jtf.setText(num); // System.out.print("222我执行啦\n"); } public void init() { d1 = new BigDecimal("0"); d1 = new BigDecimal("0"); key = "="; oper = '='; jtf.setText("0"); first = true; } public BigDecimal operate(BigDecimal a1, char c, BigDecimal a2) { MathContext mc = new MathContext(10, RoundingMode.HALF_DOWN); switch (c) { case '+': return a1.add(a2); case '-': return a1.subtract(a2); case '*': return a1.multiply(a2); case '/': if (a2.compareTo(new BigDecimal("0")) == 0) { init(); calwin.cal.move(); return new BigDecimal("0"); } return a1.divide(a2, mc); default: return a2; } } }