想要利用Java的GUI编程，实现一个Java GUI计算器应用程序界面？请问该怎么做？

3回答

弑天下

import java.awt.*;import java.awt.event.*;public class CalcAppDemo extends Frame{private TextField t_result;private Panel p_main;private Panel p_num;private Panel p_oper;private Panel p_show;private Button b_num[];private Button b_oper[];public CalcAppDemo(String title){setTitle(title);setLocation(500,300);t_result=new TextField("0.0",23);p_main=new Panel();p_num=new Panel();p_oper=new Panel();p_show=new Panel();p_main.setLayout(new BorderLayout());p_num.setLayout(new GridLayout(4,3,1,1));p_oper.setLayout(new GridLayout(4,2,1,1));b_num=new Button[12];for(int i=0;i<9;i++){b_num[i]=new Button(new Integer(i+1).toString());}b_num[9]=new Button(" 0");b_num[10]=new Button(" cls");b_num[11]=new Button(" .");for(int i=0;i<12;i++){p_num.add(b_num[i]);}b_oper=new Button[8];b_oper[0]=new Button(" +");b_oper[1]=new Button(" -");b_oper[2]=new Button(" *");b_oper[3]=new Button(" /");b_oper[4]=new Button(" pow");b_oper[5]=new Button(" sqrt");b_oper[6]=new Button(" +/-");b_oper[7]=new Button(" =");for(int i=0;i<8;i++){p_oper.add(b_oper[i]);}t_result.setEditable(false);p_show.add(t_result,BorderLayout.NORTH);p_main.add(p_show,BorderLayout.NORTH);p_main.add(p_num,BorderLayout.WEST);p_main.add(p_oper,BorderLayout.EAST);this.add(p_main,BorderLayout.CENTER);setSize(400,400);setResizable(false);pack();this.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});ButtonListener bl=new ButtonListener();for(int i=0;i<12;i++){b_num[i].addActionListener(bl);}for(int i=0;i<8;i++){b_oper[i].addActionListener(bl);}}class ButtonListener implements ActionListener{private String lastOp;private String strVal;private double total;private double number;private boolean firsttime;private boolean operatorPressed;ButtonListener(){firsttime=true;strVal="";}public void actionPerformed(ActionEvent e){String s=((Button)e.getSource()).getLabel().trim();if(Character.isDigit(s.charAt(0))){handleNumber(s);}else{calculate(s);}}void calculate(String op){operatorPressed=true;if(firsttime&&!isUnary(op)){total=getNumberOnDisplay();firsttime=false;}if(isUnary(op)){handleUnaryOp(op);}else if(lastOp!=null){handleBinaryOp(lastOp);}if(!isUnary(op)){lastOp=op;}}boolean isUnary(String s){return s.equals("=")||s.equals("cls")||s.equals("sqrt")||s.equals("+/-")||s.equals(".");}void handleUnaryOp(String op){if(op.equals("+/-")){number=negate(getNumberOnDisplay()+"");t_result.setText("");t_result.setText(number+"");return;}else if(op.equals(".")){handleDecPoint();return;}else if(op.equals("sqrt")){number=Math.sqrt(getNumberOnDisplay());t_result.setText("");t_result.setText(number+"");return;}else if(op.equals("=")){if(lastOp!=null&&!isUnary(lastOp)){handleBinaryOp(lastOp);}lastOp=null;firsttime=true;return;}else{clear();}}void handleBinaryOp(String op){if(op.equals("+")){total+=number;}else if(op.equals("-")){total-=number;}else if(op.equals("*")){total*=number;}else if(op.equals("/")){try{total/=number;}catch(ArithmeticException ae){}}else if(op.equals("pow")){total=Math.pow(total,number);}t_result.setText("");lastOp=null;strVal="";number=0;t_result.setText(total+"");}void handleNumber(String s){if(!operatorPressed){strVal+=s;}else{operatorPressed=false;strVal=s;}number=new Double(strVal).doubleValue();t_result.setText("");t_result.setText(strVal);}void handleDecPoint(){operatorPressed=false;if(strVal.indexOf(".")<0){strVal+=".";}t_result.setText("");t_result.setText(strVal);}double negate(String s){operatorPressed=false;if(number==(int)number){s=s.substring(0,s.indexOf("."));}if(s.indexOf("-")<0){strVal="-"+s;}else{strVal=s.substring(1);}return new Double(strVal).doubleValue();}double getNumberOnDisplay(){return new Double(t_result.getText()).doubleValue();}void clear(){firsttime=true;lastOp=null;strVal="";total=0;number=0;t_result.setText("0");}}public static void main(String args[]){CalcAppDemo c=new CalcAppDemo("简单计算器");c.setVisible(true);}}

0 0

哆啦的时光机

import java.awt.BorderLayout;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;public class Computer implements ActionListener{String str;String fuhao;double count1=0;double count2=0;JFrame jf =new JFrame("计算器");JTextField jtf =new JTextField(10);int a,b;public Computer(){JPanel jp =new JPanel();String[] lab ={"backs","ce","c","=","7","8","9","+","4","5","6","-","1","2","3","*","0",".","+/-","/"};jp.setLayout(new GridLayout(5,4));JButton[] jb =new JButton[lab.length];jf.add(jtf,BorderLayout.NORTH);for(int i=0;i<jb.length;i++){jb[i]=new JButton(lab[i]);jp.add(jb[i]);}for (int i=0;i<20;i++){jb[i].addActionListener(this);}jf.add(jp);//默认放在centerjf.setSize(300,200);jf.setLocation(350,250);jf.setResizable(false);jf.setVisible(true);jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}public void actionPerformed(ActionEvent ae) {String com = ae.getActionCommand();double result = 0;if(com.equals("+/-")){jtf.setText("-"+jtf.getText());}if (com.equals("backs")){String s=jtf.getText();if(str.length()>0){jtf.setText(s.substring(0, s.length()-1));}}if(com.equals("ce")||com.equals("c")){jtf.setText("0");}if("+".equals(com)){fuhao=com;count1=Double.parseDouble(jtf.getText());str=jtf.getText()+com;jtf.setText(str);}if("-".equals(com)){fuhao=com;count1=Double.parseDouble(jtf.getText());str=jtf.getText()+com;jtf.setText(str);}if("*".equals(com)){fuhao=com;count1=Double.parseDouble(jtf.getText());str=jtf.getText()+com;jtf.setText(str);}if("/".equals(com)){fuhao=com;count1=Double.parseDouble(jtf.getText());str=jtf.getText()+com;jtf.setText(str);}if("0".equals(com)||"1".equals(com)||"2".equals(com)||"3".equals(com)||"4".equals(com)||"5".equals(com)||"6".equals(com)||"7".equals(com)||"8".equals(com)||"9".equals(com)){ jtf.setText(jtf.getText()+com);}if("=".equals(com)){str=jtf.getText()+com;count2=Double.parseDouble(str.substring(str.indexOf(fuhao)+1,str.length()-1));if("+".equals(fuhao)) result=count1+count2;if("-".equals(fuhao)) result=count1-count2;if("*".equals(fuhao)) result=count1*count2;if("/".equals(fuhao)) result=count1/count2;jtf.setText(result+"");}}// TODO Auto-generated method stubpublic static void main(String[] args) {new Computer();}}

0 0

12345678_0001

import java.awt.*;public class TestGridLayout {public static void main(String[] args) {Frame f = new Frame("计算器");Panel p = new Panel(new GridLayout(3,5,4,4));String[] key = new String[]{"0","1","2","3","4","5","6","7","8","9","*","-","+","/","."};for(int i=0;i<15;i++){p.add(new Button(key[i]));}f.add(p,BorderLayout.CENTER);f.add(new TextField(30), BorderLayout.NORTH);f.setLocation(300,300);f.pack();f.setVisible(true);}}没写全,写全太麻烦了,程序也发不上去

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