Set

Java集合操作示例

最新推荐文章于 2025-11-30 18:24:05 发布

最新推荐文章于 2025-11-30 18:24:05 发布 · 126 阅读

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#java

/**
*@(#)SetExample.java
*
*
*@author
*@version1.002008/9/28

*/
importjava.util.*;

publicclassSetExample{

publicSetExample(){
}

publicstaticvoidmain(String[]args)
{

Set<Integer>s1=newHashSet<Integer>();

Collection<Integer>s2=newHashSet<Integer>();

inti;

for(i=0;i<10;i++)
s1.add(i);

for(i=10;i<100;i++)
s2.add(i);

for(i=10;i<20;i++)
s2.add(i);

System.out.println("beforeretainAlls1:"+s1);

System.out.println("beforeretainAlls2:"+s2);
s2.retainAll(s1);

System.out.println("afterretainAlls2:"+s2);
s2.addAll(s1);

System.out.println("afetraddAlls2"+s2);
s2.clear();

System.out.println("afterclear:s2"+s2);
}
}
//result:
before retainAll s1:[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
before retainAll s2:[10, 11, 12, 13, 14, 15, 17, 16, 19, 18, 21, 20, 23, 22, 25, 24, 27, 26, 29, 28, 31, 30, 34, 35, 32, 33, 38, 39, 36, 37, 42, 43, 40, 41, 46, 47, 44, 45, 51, 50, 49, 48, 55, 54, 53, 52, 59, 58, 57, 56, 63, 62, 61, 60, 68, 69, 70, 71, 64, 65, 66, 67, 76, 77, 78, 79, 72, 73, 74, 75, 85, 84, 87, 86, 81, 80, 83, 82, 93, 92, 95, 94, 89, 88, 91, 90, 98, 99, 96, 97]
after retainAll s2:[]
afetr addAll s2[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
after clear:s2[]