jdk新特性总结

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1、开发过程中接触到了从jdk1.5---jdk1.7的使用，在不同的阶段，都使用过了jdk的一些新特性，操作起来更加方面啦！特此总结了下，与喜欢it的朋友共勉！呵呵以下是测试代码：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

2、用的是享元模式  Integeri3=Integer.valueOf(213);  Integeri4=Integer.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());  WeekDayweek

3、Day2=WeekDay.FRI;  System.out.println(weekDay2);  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,

4、WED,THI,FRI,SAT;  privateWeekDay(){System.out.println("first");}  privateWeekDay(intday){System.out.println("second");}}publicenumTrafficLamp{  RED(30){   publicTrafficLampnextLamp(){    returnGREEN;   }  },  GREEN(45){   publicTrafficLampnextLamp(){    returnYELLOW;   }     },  YELLO

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

6、nally{   System.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、Info.