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1、第二章习题2.2importjava.util.*;classMyDate{privateintyear;privateintmonth;privateintday;publicMyDate(inty,intm,intd){//构造函数，构造方法year=y;month=m;day=d;}//endpublicMyDate(inty,intm,intd)publicintgetYear(){//返回年returnyear;}//endgetYear()publicintgetMonth(){//返回月returnmonth;}//endgetMonth()publicintgetDa
2、y(){//返回日returnday;}//endgetDay()}//endclassMyDateclassEmployee{privateStringname;privatedoublesalary;privateMyDatehireDay;publicEmployee(Stringn,doubles,MyDated){name=n;salary=s;hireDay=d;}//endpublicEmployee(Stringn,doubles,MyDated)publicvoidprint(){System.out.println("名字:"+name+"工资:"+salar
3、y+"雇佣年份:"+hireYear()+"");}//endprint()publicvoidraiseSalary(doublebyPercent){salary*=1+byPercent/100;}//endpublicinthireYear(){returnhireDay.getYear();}}//endclassEmployeepublicclassMyTestClass{publicstaticvoidmain(String[]args){Employee[]staff=newEmployee[3];staff[0]=newEmployee("HarryHack
4、er",35000,newMyDate(1989,10,1));staff[1]=newEmployee("CarlCarcker",75000,newMyDate(1987,12,15));staff[2]=newEmployee("TonyTester",38000,newMyDate(1990,3,12));intintegerValue;System.out.println("Theinformationofemployeeare:");for(integerValue=0;integerValue<=2;integerValue++){staff[integerValue]
5、.raiseSalary(5);}//endfor()for(integerValue=0;integerValue<=2;integerValue++){staff[integerValue].print();}//endfor()}//endmain()}//endclassMyTestClass//习题2.4importjava.util.*;publicclassDataType{publicstaticvoidmain(String[]args){booleanflag;charyesChar;bytefinByte;intintValue;longlongValue;sh
6、ortshortValue;floatfloatValue;doubledoubleValue;flag=true;yesChar='y';finByte=30;intValue=-7000;longValue=200l;shortValue=20000;floatValue=9.997E-5f;doubleValue=floatValue*floatValue;System.out.println("thevaluesare:");System.out.println("布尔类型变量flag="+flag);System.out.println("字符型变量yesChar="+ye
7、sChar);System.out.println("字节型变量finByte="+finByte);System.out.println("整型变量intValue="+intValue);System.out.println("长整型变量longValue="+longValue);System.out.println("短整型变量shortValue="+shortValue);System.out.println("浮点型变量floatValue=
