Java簡單計算器實驗報告

1、簡單計算器（Java）目錄運行界面2實驗代碼2運行界面實驗代碼package Computer;import javax.swing.*;import java.awt.*;import java.awt.event.*;public class MyComputer extends JFrame implements ActionListenerJTextArea memoryArea = new JTextArea(,1,3);JTextArea dispresult = new JTextArea(0. ,1,20);JButton clear = new JButton(C);JBut

2、ton jbuttons = new JButton24; /*double result = 0, first = 0, second = 0;double memery = 0;char firstsymbol = 0, secondsymbol=0;boolean prev = true, repeat = true, dot = true;MyComputer() /定義顯示樣式super(Calculator);try UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName();catch(Exception

3、e) System.out.print(e);JPanel resultField = new JPanel();/放置結果、清除鍵、保存標識的區(qū)域，上半部分JPanel buttonField = new JPanel();/放置按鍵，下半部分Container all = getContentPane();/組合上述兩部分GridLayout grid1 = new GridLayout(4,6,3,3);/按鍵memoryArea.setEditable(false);clear.addActionListener(this);dispresult.setEditable(false);

4、resultField.add(memoryArea);resultField.add(clear);resultField.add(dispresult);all.setLayout(new FlowLayout();all.add(resultField);String buttonname = sin,MC,0,1,2,+,cos,MR,3,4,5,-,tan,MS,6,7,8,x,+/-,M+,9,.,=,/;buttonField.setLayout(grid1);for(int i=0;i6;i+)for(int j=0;j4;j+) jbuttonsi*4+j = new JBu

5、tton(buttonnamei*4+j);jbuttonsi*4+j.addActionListener(this);/為按鍵注冊監(jiān)聽器buttonField.add(jbuttonsi*4+j);all.add(buttonField);setSize(400,210);setResizable(true);setVisible(true);public void pressNumber(String n) if(prev) dispresult.setText(n);prev = false;else dispresult.append(n);public boolean divide(

6、double d) if(d=0) dispresult.setText(除數(shù)不能為0！);prev = true;repeat = true;firstsymbol=0;secondsymbol=0;return true;return false;public void actionPerformed(ActionEvent e) Object source = e.getSource();/判斷事件源，進行相應處理if(source=clear) dispresult.setText(0.);firstsymbol=0;secondsymbol=0;prev = true;repeat

7、= true;dot = true;return;if(source=jbuttons0) double temp = Math.sin(Double.parseDouble(dispresult.getText();dispresult.setText(String.valueOf(temp);prev = true;repeat = false;dot = true;return;if(source=jbuttons1) memery = 0;memoryArea.setText( );prev = true;repeat = false;dot = true;return;if(sour

8、ce=jbuttons2) pressNumber(0);repeat = false;return;if(source=jbuttons3) pressNumber(1);repeat = false;return;if(source=jbuttons4) pressNumber(2);repeat = false;return;if(source=jbuttons6) double temp = Math.cos(Double.parseDouble(dispresult.getText();dispresult.setText(String.valueOf(temp);prev = tr

9、ue;repeat = false;dot = true;return;if(source=jbuttons7) if(memoryArea.getText().equals( M )dispresult.setText(String.valueOf(memery);prev=true;repeat=false;dot=true;return;if(source=jbuttons8) pressNumber(3);repeat=false;return;if(source=jbuttons9) pressNumber(4);repeat=false;return;if(source=jbutt

10、ons10) pressNumber(5);repeat=false;return;if(source=jbuttons12) double temp=Math.tan(Double.parseDouble(dispresult.getText();dispresult.setText(String.valueOf(temp);prev=true;repeat=false;dot=true;return;if(source=jbuttons13) memery = Double.parseDouble(dispresult.getText();if(memery !=0) memoryArea

11、.setText( M );prev=true;repeat=false;dot=true;return;if(source=jbuttons14) pressNumber(6);repeat=false;return;if(source=jbuttons15) pressNumber(7);repeat=false;return;if(source=jbuttons16) pressNumber(8);repeat=false;return;if(source=jbuttons18) double temp=-Double.parseDouble(dispresult.getText();d

12、ispresult.setText(String.valueOf(temp);prev=true;repeat=false;dot=true;return;if(source=jbuttons19) memery += Double.parseDouble(dispresult.getText();if(memery !=0) memoryArea.setText( M );prev=true;repeat=false;dot=true;return;if(source=jbuttons20) pressNumber(9);repeat=false;return;if(source=jbutt

13、ons21) if(dot) pressNumber(.);dot = false;repeat = false;return;if(source=jbuttons22) second = Double.parseDouble(dispresult.getText();dot = true;switch(secondsymbol) case*:second *= first;break;case/:if(divide(second)return;second = first/second;/end of switch(secondsymbol)secondsymbol = 0;switch(f

14、irstsymbol) case +:result += second;break;case -:result -=second;break;case *:result *=second;dispresult.setText(String.valueOf(result);break;case /:if(divide(second)return;result /=second;/end of switch(firstsymbol)if(firstsymbol !=0) dispresult.setText(String.valueOf(result);firstsymbol = 0;prev =

15、 true;repeat = false;return;if(source=jbuttons5) dot = true;if(repeat) firstsymbol = +;return;second=Double.parseDouble(dispresult.getText();switch(secondsymbol) case *:second *=first;break;case /:if(divide(second) return;second=first/second;/end of switch(secondsymbol)secondsymbol=0;switch(firstsym

16、bol) case 0:result=second;firstsymbol=+;break;case +:result +=second;dispresult.setText(String.valueOf(result);break;case -:result -=second;firstsymbol = +;dispresult.setText(String.valueOf(result);break;case *:result *=second;firstsymbol =+;dispresult.setText(String.valueOf(result);break;case /:if(

17、divide(second) return;result /=second;firstsymbol=+;dispresult.setText(String.valueOf(result);/end of switch(firstsymbol)prev=true;repeat=true;return;if(source = jbuttons11) dot=true;if(repeat) firstsymbol=-;return;second=Double.parseDouble(dispresult.getText();switch(secondsymbol) case *:second *=f

18、irst;break;case /:if(divide(second) return;second=first/second;secondsymbol=0;switch(firstsymbol) case 0:result=second;firstsymbol=-;break;case +:result+=second;firstsymbol=-;dispresult.setText(String.valueOf(result);break;case -:result -=second;dispresult.setText(String.valueOf(result);break;case *

19、:result *=second;firstsymbol=-;dispresult.setText(String.valueOf(result);break;case /:if(divide(second) return;result /=second;firstsymbol=-;dispresult.setText(String.valueOf(result);prev=true;repeat=true;return;if(source=jbuttons17) dot=true;if(repeat) if(secondsymbol=0) firstsymbol=*;else secondsy

20、mbol=*;return;second=Double.parseDouble(dispresult.getText();switch(secondsymbol) case 0:switch(firstsymbol) case 0:firstsymbol=*;result=second;break;case +:case -:first=second;secondsymbol=*;break;case *:result *=second;dispresult.setText(String.valueOf(result);break;case /:if(divide(second) return

21、;result /=second;dispresult.setText(String.valueOf(result);firstsymbol=*;break;case *:first *=second;dispresult.setText(String.valueOf(first);break;case /:if(divide(second) return;first /=second;secondsymbol=*;dispresult.setText(String.valueOf(first);prev=true;repeat=true;return;if(source=jbuttons23) dot=true;if(repeat) if