list的使用

for(int i=0;i<10;i++){
            do{
                 k=ran.nextInt(100);
            }while(intList.contains(k));
            intList.add(k);
            

public void testSort2() {
		List<String> stringList = new ArrayList<String>();
		stringList.add("lalala");
		stringList.add("hello");
		stringList.add("nonono");
		System.out.println("-----排序前----");
		for (String st : stringList) {
			System.out.println(st);
		}
		Collections.sort(stringList);
		System.out.println("-----排序后----");
		for (String st : stringList) {
			System.out.println(st);
		}
	}

public class Student implements Comparable<Student>
public int compareTo(Student o) {    
        return this.id.compareTo(o.id);
    }
public void testSort3(){
		List<Student> studentList=new ArrayList<Student>();
		studentList.add(new Student(3+"  ","小明", null));
		studentList.add(new Student(2+"  ","小红", null));
		studentList.add(new Student(1+"  ","小方", null));
		System.out.println("----排序前----");
		
		for(Student temp:studentList){
			System.out.println("学生"+temp.name);
		}
		Collections.sort(studentList);
		System.out.println("----排序后----");
		
		for(Student temp:studentList){
			System.out.println("学生"+temp.name);
		}
	}