6个java源代码~

java计算器 import java.awt.*; import javax.swing.*; import java.awt.event.*; class calculation extends JFrame {public calculation() /*构造方法*/ {super("计数器"); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); initTextPanel(); /*文本框*/ initControlPanel(); /*控制键*/ initKeyPanel(); /*数字和运算符*/ Container pane = getContentPane(); pane.setLayout(new BorderLayout()); pane.add(TextPanel,BorderLayout.NORTH); pane.add(ControlPanel,BorderLayout.CENTER); pane.add(KeyPanel,BorderLayout.SOUTH); pack(); try {UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel"); } catch(Exception ex) {;} /*设置Windons观感*/ SwingUtilities.updateComponentTreeUI(this); setResizable(false); setVisible(true); } private void initTextPanel() /*设置文本框*/ { TextPanel=new JPanel(); TextPanel.setLayout(new FlowLayout()); Resultarea =new JTextField("0",25); Resultarea.setEditable(false); /*设置不可编辑*/ Color color=Color.white; Resultarea.setBackground(color); /*颜色*/ Resultarea.setHorizontalAlignment(JTextField.RIGHT); /*设置显示位置*/ TextPanel.add(Resultarea); } private void initControlPanel() /*设置控制键*/ {ControlPanel=new JPanel(); ControlPanel.setLayout(new GridLayout(1,3,4,4)); JButton b1=new JButton("Backspace"); /*Backspace键*/ b1.setFont(font1); b1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {String s1=Resultarea.getText(); int l=s1.length(); Resultarea.setText(s1.substring(0 ,l-1)); } }); ControlPanel.add(b1); JButton b2=new JButton("CE"); /*CE键*/ b2.setFont(font1); b2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {Resultarea.setText("0"); isNew=true; } }); ControlPanel.add(b2); JButton b3=new JButton("C"); /*C键*/ b3.setFont(font1); b3.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {Resultarea.setText("0"); pnum=""; operation=""; isNew=true; } }); ControlPanel.add(b3); } private void initKeyPanel() /*设置数字键和运算符键*/ {String key[] = {"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="}; KeyPanel = new JPanel(); KeyPanel.setLayout(new GridLayout(4,5,4,4)); for(int i=0;i<20;i++) {String label = key[i]; JButton b = new JButton(label); b.setActionCommand(key[i]); b.setFont(font2); KeyPanel.add(b); b.addActionListener(new ActionListener() /*无名监听器*/ {public void actionPerformed(ActionEvent e) {Key_actionPerformed(e); } }); } } public void Key_actionPerformed(ActionEvent e) /*数字键和运算符键无名监听器*/ {String s=(e.getActionCommand()); String st=Resultarea.getText(); if(s.equals("0")) /*输入数为0*/ {if(st.equals("0")) return; else {if(!isNew) Resultarea.setText(st+"0"); else Resultarea.setText("0"); } isNew=false; return; } if(s.equals("+/-")) /*输入数为+/-*/ {double k=Double.parseDouble(st); {if(k!=0) display(-k); } return; } if(s.equals("1")||s.equals("2")||s.equals("3")||s.equals("4")||s.equals("5")||s.equals("6")||s.equals("7")||s.equals("8")||s.equals("9")) /*输入1-9*/ {if(!isNew) Resultarea.setText(st+s); else { Resultarea.setText(s); isNew=false; } return; } if(s.equals(".")) /*输入小数点*/ {if(Resultarea.getText().indexOf(".")==-1) /*不存在小数点*/ {if(isNew) {Resultarea.setText("0."); isNew=false; } else Resultarea.setText(st+"."); } return; } isNew=true; /*按下运算符，输入新的数*/ if(s.equals("=")) {compute(s); operation=""; } else {if(s.equals("+")||s.equals("-")||s.equals("*")||s.equals("/")) /*二目运算符号*/ {if(operation.equals("")) {pnum=Resultarea.getText(); operation=s; } else compute(s); } else /*一目运算*/ {Count count1=new Count(Double.parseDouble(st)); if(s.equals("sqrt")) { display(count1.sqrt()); } else {if(s.equals("1/x")) {if(st.equals("0")) {Resultarea.setText("除数不能为0."); operation=""; pnum=""; } else display(count1.reciprocal()); /*求倒数*/ } else display(Double.parseDouble(st)/100); /*输入%，使当前显示的值除于100*/ } } } } private void compute(String s) {if(s.equals("=")) {if(operation.equals("")) return; } double data1=Double.parseDouble(pnum); double data2=Double.parseDouble(Resultarea.getText()); Count count2=new Count(data1,data2); /*加减乘除计算*/ if(operation.equals("+")) display((count2.plus())); else {if(operation.equals("-")) display((count2.minus())); else {if(operation.equals("*")) display((count2.multiply())); else if(operation.equals("/")) {if(data2==0) {Resultarea.setText("除数不能为0"); operation=""; pnum=""; return; } else display((count2.divide())); } } } operation=""; /*符号为当前符*/ pnum=Resultarea.getText();/*运算数为当前文本数*/ } public void display(double result) /*显示输出方法*/ {int a=(int)result; if(a==result) Resultarea.setText(String.valueOf(a)); else Resultarea.setText(String.valueOf(result)); if(Resultarea.getText().equals("NaN")) Resultarea.setText("输入函数无效"); } private JPanel TextPanel; /*文本框棉板*/ private JTextFiel