java代码实例

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1、第三章--数据类型、变量和表达式：1.publicclassByteTest{publicstaticvoidmain(String[]args){inta;byteb;a=256;b=(byte)a;System.out.println(b);}}2.publicclassFloatTest{publicstaticvoidmain(String[]args){floatf;f=1.3;System.out.println(f);}}3.importjavax.swing.JOptionPan

2、e;publicclassComputeArea{publicstaticvoidmain(String[]args){doubleradius;doublearea;radius=Double.parseDouble(JOptionPane.showInputDialog("请输入半径值"));area=radius*radius*3.14159;JOptionPane.showMessageDialog(null,"area="+area);}}第四章—控制：1.//MyInput.java

3、:Containthemethodsforreadingint,double,and//stringvaluesfromthekeyboardimportjava.io.*;publicclassMyInput{//ReadastringfromthekeyboardpublicstaticStringreadString(){BufferedReaderbr=newBufferedReader(newInputStreamReader(System.in),1);//Declareandini

4、tializethestringStringstring="";//Getthestringfromthekeyboardtry{string=br.readLine();}catch(IOExceptionex){System.out.println(ex);}//Returnthestringobtainedfromthekeyboardreturnstring;}//ReadanintvaluefromthekeyboardpublicstaticintreadInt(){returnIn

5、teger.parseInt(readString());}//ReadadoublevaluefromthekeyboardpublicstaticdoublereadDouble(){returnDouble.parseDouble(readString());}//ReadabytevaluefromthekeyboardpublicstaticdoublereadByte(){returnByte.parseByte(readString());}//Readashortvaluefro

6、mthekeyboardpublicstaticdoublereadShort(){returnShort.parseShort(readString());}//ReadalongvaluefromthekeyboardpublicstaticdoublereadLong(){returnLong.parseLong(readString());}//ReadafloatvaluefromthekeyboardpublicstaticdoublereadFloat(){returnFloat.

7、parseFloat(readString());}}2.importjava.io.*;publicclassLoanCompute{publicstaticvoidmain(String[]args){doubleloan,ratio,monthlyPay,totalPay;intyear;loan=ratio=monthlyPay=totalPay=0;year=0;BufferedReaderbr=newBufferedReader(newInputStreamReader(System

8、.in),1);System.out.println("inputLoan:");try{loan=Double.parseDouble(br.readLine());}catch(IOExceptionex){System.out.println(ex);}if(loan<0){System.out.println("Loaniswrong:");System.exit(0);}System.out.println("inputyear:");try{year=Integer.parseInt