Java数组和各种List的性能 比较Java数组和各种List的性能小结

package cn.lion.test;
public class PerformanceTest {
   
   privatestatic final int SIZE =100000;
   publicstatic abstract class Test{
     privateString operation;
     publicTest(String operation){
       this.operation= operation;
     }
     publicabstract void test(List<String> list);
     publicString getOperation(){
       returnoperation;
     }
   }
   //执行迭代操作的匿名类
   staticTest iterateTest = new Test("iterate"){
     publicvoid test(List<String> list){
       for(inti=0; i<10; i++){
          Iterator<String>it = list.iterator();
          while(it.hasNext()){
            it.next();
          }
       }
     }
   };
   //执行随机访问的匿名类
   staticTest getTest = new Test("get"){
     publicvoid test(List<String> list){
       for(inti=0; i<list.size(); i++){
          for(intk=0; k<10; k++){
            list.get(k);
          }
       }
     }
   };
   //执行插入的匿名类
   staticTest insertTest = new Test("insert"){
     publicvoid test(List<String> list){
       ListIterator<String>it = list.listIterator(list.size()/2);
       for(inti=0; i<SIZE; i++){
          it.add("lion");
       }
     }
   };
   //执行删除的匿名类
   staticTest removeTest = new Test("remove"){
     publicvoid test(List<String> list){
       ListIterator<String>it = list.listIterator();
       while(it.hasNext()){
          it.next();
          it.remove();
       }
     }
   };
   staticpublic void testArray(List<String> list){
     Test[]tests = {iterateTest, getTest};
     test(tests,list);
   }
   staticpublic void testList(List<String> list){
     Test[]tests = {insertTest, iterateTest, getTest, removeTest};
     test(tests,list);
   }
   staticpublic void test(Test[] tests, List<String> list){
     for(inti=0; i<tests.length; i++){
       System.out.print(tests[i].getOperation()+ "操作：");
       longt1 = System.currentTimeMillis();
       tests[i].test(list);
       longt2 = System.currentTimeMillis();
       System.out.print(t2-t1+ "ms");
       System.out.println();
     }
   }
   publicstatic void main(String[] args){
     
     List<String>list = null;
     //测试数组的迭代和随机访问操作
     System.out.println("------测试数组------");
     String[]tstr = new String[SIZE];
     Arrays.fill(tstr,"lion");
     list= Arrays.asList(tstr);
     testArray(list);
     
     tstr= new String[SIZE/2];
     Collection<String>coll = Arrays.asList(tstr);
     
     //测试Vector
     System.out.println("------测试Vector------");
     list= new Vector<String>();
     list.addAll(coll);
     testList(list);
     
     //测试LinkedList
     System.out.println("------测试LinkedList------");
     list= new LinkedList<String>();
     list.addAll(coll);
     testList(list);
     
     //测试ArrayList
     System.out.println("------测试Vector------");
     list= new ArrayList<String>();
     list.addAll(coll);
     testList(list);
   }
}