计算器JAVA代码

1、计算器简单功能实现的JAVA代码import java.awt.*;import java.awt.eve nt.*;import javax.swi ng.*;p ublic class jisua nqi exte nds JFrame impi eme nts Action Liste ner /* Serial Versio n UID*/private static fin al lo ng serialVersio nUID = -169068472193786457L;/* This class help close the Win dow.* author Sin gyue n

2、 Yip*/p rivate class Win dowCloser exte nds Win dowAda pter p ublic void wi ndowClosi ng(Wi ndowEve nt we) System.exit(0);int i;/ Strings for Digit & Op erator butt ons.private final Stri ng str = 7, 8, 9, /, 4, 5, 6, *, 1, 2, 3, -, ., 0, =, + ;/ Build butt on s.JButto n butto ns = new JButto n str.

3、le ngth;/ For cancel or reset.JButton reset = new JButto n( CE);/ Build the text field to show the result.JTextField dis play = new JTextField(O);/* Con structor without p arameters.*/p ublic jisua nqi() sup er(Calculator);/ Add a pan el.JPanel pan el1 = new JPan el( new GridLayout(4, 4);/ pan el1.s

4、etLayout( new GridLayout(4,4);for (i = 0; i str.le ngth; i+) butto nsi = new JButto n(stri);pan el1.add(butt on si);JPanel pan el2 = new JPan el( new BorderLayout();/ pan el2.setLayout (new BorderLayout();pan el2.add(Ce nter, dis play);pan el2.add(East, reset);/ JPanel pan el3 = new Pan el();getC on

5、tentPan e().setLayout (new BorderLayout();getCo ntentPan e().add(North, pan el2);getCo ntentPan e().add(Ce nter, pan el1);/ Add acti on liste ner for each digit & op erator butt on. for (i = 0; i 0) han dleNumber(label);elsehan dle Op erator(label);/ Is the first digit p ressed? boolea n isFirstDigi

6、t = true;/* Number han dli ng.* p aram key the key of the butt on.*/p ublic void han dleNumber(Stn ng key) if (isFirstDigit)dis play.setText(key);else if (key.equals(.) & (dis play.getText().i ndexOf(.) 0)dis play.setText(dis play.getText() + .);else if (!key.equals(.)dis play.setText(dis play.getTe

7、xt() + key); isFirstDigit = false;/* Reset the calculator.*/p ublic void han dleReset() dis play.setText(0); isFirstDigit = true; op erator =;double nu mber = 0.0;String op erator =;/* Han dli ng the op erati on.* p aram key p ressed op erators key.*/p ublic void han dle Op erator(Stri ng key) if (o

8、p erator.equals(+)nu mber += Double.valueOf(dis play.getText(); else if (op erator.equals(-)nu mber -= Double.valueOf(dis pl ay.getText(); else if (op erator.equals(*)nu mber *= Double.valueOf(dis play.getText(); else if (op erator.equals(/)nu mber /= Double.valueOf(dis play.getText(); else if (op erator.equals(=)nu mber = Double.valueOf(dis play.getText(); dis play.setText(Stri ng.valueOf( nu mb