Without further ado, just look at the sample code
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(){ return; } } //Anonymous class 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(); } } } } } }; //Execute random access anonymous class 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); } } } } } }; //Execute insertTest 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"); } } } }; //Execute the deleted anonymous class 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()+ "Operation:"); 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; //Iteration and random access operations of test array System.out.println("-------------"); 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); //Test Vector System.out.println("---------------"); list= new Vector<String>(); list.addAll(coll); testList(list); //Test LinkedList System.out.println("--------------"); list= new LinkedList<String>(); list.addAll(coll); testList(list); //Test ArrayList System.out.println("-------------"); list= new ArrayList<String>(); list.addAll(coll); testList(list); }}The operation results are shown in the figure
From the results, we can see that the speed of random access and iterating the array is the fastest; the speed of inserting and deleting the LinkedList is the fastest; the speed of random access to the ArrayList is also very fast; the Vector class has no outstanding performance in all aspects, and this type is no longer recommended.
Summarize
The above is all about this article, I hope it will be helpful for everyone to learn or use Java. If you have any questions, please leave a message to discuss.