jdk1.5-1.8的新特性

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1、jdk1.5---jdk1.8的新特性JDK1.5新特性：1.自动装箱与拆箱：IntegeriObj=3;System.out.println(iObj+12);  Integeri1=137(-128--127范围时，为true);  Integeri2=137(-128--127范围时，为true);  System.out.println(i1==i2);//false，但是括号中时却返回ture，原因是Integer采用的是享元模式  Integeri3=Integer.valueOf(213);  Integeri4=Intege

2、r.valueOf(213);  System.out.println(i3==i4);//同上，另一种包装形式 2.枚举(常用来设计单例模式)publicclassEnumTest{/***@paramargs*/publicstaticvoidmain(String[]args){  WeekDay1weekDay=WeekDay1.MON;  System.out.println(weekDay.nextDay());  WeekDayweekDay2=WeekDay.FRI;  System.out.println(weekDay2

3、);  System.out.println(weekDay2.name());  System.out.println(weekDay2.ordinal());   System.out.println(WeekDay.valueOf("SUN").toString());  System.out.println(WeekDay.values().length);  newDate(300){};}publicenumWeekDay{  SUN(1),MON(),TUE,WED,THI,FRI,SAT;  privateWeekDay()

4、{System.out.println("first");}  privateWeekDay(intday){System.out.println("second");}}publicenumTrafficLamp{  RED(30){   publicTrafficLampnextLamp(){    returnGREEN;   }  },  GREEN(45){   publicTrafficLampnextLamp(){    returnYELLOW;   }     },  YELLOW(5){   publicTrafficL

5、ampnextLamp(){    returnRED;   }     };  publicabstractTrafficLampnextLamp();  privateinttime;  privateTrafficLamp(inttime){this.time=time;}}}3.静态导入importstaticjava.lang.Math.*;publicclassStaticImport{publicstaticvoidmain(String[]args){  intx=1;  try{   x++;  }finally{   S

6、ystem.out.println("template");  }  System.out.println(x);      System.out.println(max(3,6));  System.out.println(abs(3-6));  }}4.可变参数publicclassVarableParameter{/***@paramargs*/publicstaticvoidmain(String[]args){  System.out.println(add(2,3));  System.out.println(add(2,3,5

7、));  }publicstaticintadd(intx,int...args){  intsum=x;/*  for(inti=0;i

8、ptor[]pds=beanInfo.getPropertyDescriptors();  ObjectretVal=null;  for(PropertyDescriptorp