[随记]JDK5的并集、交集、差集

自己写个Example，随记一下，用JDK API做起来确实很方便

importjava.util.HashSet;


publicclassTestSet...{

/***//**
*@paramargs
*/
publicstaticvoidmain(String[]args)...{

HashSet<Integer>setA=newHashSet<Integer>();
setA.add(1);
setA.add(3);
setA.add(5);

HashSet<Integer>setB=newHashSet<Integer>();
setB.add(4);
setB.add(5);

HashSet<Integer>setC=newHashSet<Integer>();

//并集setA+setB
setC.clear();
setC.addAll(setA);
setC.addAll(setB);
System.out.println("setC="+setC);

//交集setA∩setB
setC.clear();
setC.addAll(setA);
setC.retainAll(setB);
System.out.println("setC="+setC);

//差集setA-setB
setC.clear();
setC.addAll(setA);
setC.removeAll(setB);
System.out.println("setC="+setC);
}

}