泛型

Collections类

public static 
    
     > void sort(List
     
       list) {    Object[] a = list.toArray();    Arrays.sort(a);    ListIterator
      
        i = list.listIterator();    for (int j=0; j
       
        > void sort(List
        
          list) {    Object[] a = list.toArray();    Arrays.sort(a);    ListIterator
         
           i = list.listIterator(); for (int j=0; j
         
        
       
      
     
    

测试类

Student没有实现比较接口Comparable，编译器报错。

代码

package sort;import java.util.ArrayList;import java.util.Collections;import java.util.List;public class ArrayListTest {	public static void main(String[] args) {		List
    
      a = new ArrayList
     
      ();		Collections.sort(a);	}}复制代码