Java-数组

public class Students {
    private String name;
    private int credit;
    private int age;
    public Students(String name,int credit,int age){
        this.name = name;
        this.credit = credit;
        this.age  =age;
    }
    
    public void setName(String name){
        this.name = name;
    }
    public String getName(){
        return name;
    }
    public void setCredit(int credit){
        this.credit = credit;
    }
    public int getCredit(){
        return credit;
    }
    public void setaAge(int age){
        this.age = age;
    }
    public int getAge(){
        return age;
    }
    public void show(){
        System.out.println("Name "+ name+" Credit " + credit+ " Age "+ age+"\n");
    }
}

    public static void main(String[] args){
        String name;
        int age;
        int credit;
        System.out.println("请输入学生个数");
        Scanner sc = new Scanner(System.in);
        int size = sc.nextInt();
        Students[] stuarray = new Students[size];
        for(int i = 0; i < stuarray.length;i++){
            stuarray[i]=new Students();
            System.out.println("请输入学生姓名");
            name = sc.next();
            stuarray[i].setName(name);
//            System.out.println(stuarray[i].getName());
            System.out.println("请输入学生学分");
            credit = sc.nextInt();
            stuarray[i].setCredit(credit);
            System.out.println("请输入学生年龄");
            age = sc.nextInt();
            stuarray[i].setaAge(age);
        }

    public void sort1(Students[] stus){
        for(int i = 0; i < stus.length - 1;i++)
        {
            int min_index = i;
            for(int j = i + 1; j < stus.length;j++){
                if((stus[i].getName()).compareTo((stus[j].getName())) >0 ){
                    min_index = j;
                }
                
            }
            //这个地方能够成功转换吗？能！
            if(min_index != i){
                Students temp = stus[min_index];
                stus[min_index] = stus[i];
                stus[i] = temp;
            
            }
        }
    }
    public void sort2(Students[] stus){
        boolean a = true;
        while(a){
            a = false;
            for(int i = 0; i < stus.length - 1;i++){
                if(stus[i].getCredit() > stus[i+1].getCredit()){
                    Students temp = stus[i];
                    stus[i] = stus[i+1];
                    stus[i+1] = temp;
                    a = true;
                }
            }
        }
    }
    
    public void sort3(Students[] stus){
        for(int i = 1; i < stus.length;i++){
            Students temp = stus[i];
            int j = i - 1;
            for(;j >=0 && stus[j].getAge() > stus[i].getAge();j--){
                stus[j+1] = stus[j];
            }
            stus[j+1] = temp;
        }
    }

SortOfinformation a = new SortOfinformation();
        
        a.sort1(stuarray);
        System.out.println("名字排序以后的输出");
        a.showName(stuarray);
        a.sort2(stuarray);
        System.out.println("学分排序后输出");
        a.showCredit(stuarray);
        a.sort3(stuarray);
        System.out.println("年龄排序后输出");
        a.showAge(stuarray);