Java 运行出错 Exception in thread "main" 求大佬帮解决

[Whistleྂ]

import java.util.*;

class Student implements Comparable {
	private int no;
	private String name;
	private int score;

	public Student(int no, String name, int score) {
		this.no = no;
		this.name = name;
		this.score = score;
	}

	public int getNo() {
		return no;
	}

	public void setNo(int no) {
		this.no = no;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public int getScore() {
		return score;
	}

	public void setScore(int score) {
		this.score = score;
	}
	 public boolean equals(Object o) {
	        if (this == o) return true;
	        if (o == null || getClass() != o.getClass()) return false;
	        Student student = (Student) o;
	        return no == student.no;
	    }

	    @Override
	    public int hashCode() {
	        return Objects.hash(no);
	    }

	    @Override
	    public String toString() {
	        return "no:" + this.no + " name:" + this.name + " score:" + this.score;
	    }
	    @Override
	    public int compareTo(Object o) {
	        return this.no - ((Student)o).getNo();
	    }
}
public class testmain12{
	
	public static void main(String[] args) {
		List <Student> list = new LinkedList<Student>();
		Scanner sc =  new Scanner(System.in);
		int num = sc.nextInt();
		for (int i = 0; i < num;++i) {
			list.add(new Student (sc.nextInt(),sc.next(),sc.nextInt()));
		}
		num = sc.nextInt();
		for (int i = 0; i < num; ++i) {
			String s = sc.next();
			switch (s) {
			case "add": 
				list.add(new Student (sc.nextInt(),sc.next(),sc.nextInt()));
			
			case "delete":
				int n = sc.nextInt();
				int len = list.size();
				for (int j = 0; j < len;++j) {
					if (list.get(j).getNo() == n)list.remove(j);
					break;
				}
			
			case "set" :
				int nn = sc.nextInt();
				int score = sc.nextInt();
				int lenl = list.size();
				for (int j = 0; j < lenl;++j) {
					if (list.get(j).getNo() == nn) {
						list.get(j).setScore(score);
						break;
					}
				}
			}
		}
			Object[] objects = list.toArray();
			Arrays.sort(objects);
			for(int j = 0; j < objects.length; j++) {
				System.out.println(objects[j]);
			}
		/*int l = list.size();
	    for (int k = 0; k < l; ++k)System.out.println(list.get(i));*/
		sc.close();
	 
	
	}
	
}

编译没问题，运行出错
出错信息：
Exception in thread "main" java.util.InputMismatchException
at java.base/java.util.Scanner.throwFor(Scanner.java:939)
at java.base/java.util.Scanner.next(Scanner.java:1594)
at java.base/java.util.Scanner.nextInt(Scanner.java:2258)
at java.base/java.util.Scanner.nextInt(Scanner.java:2212)
at testmain12.main(testmain12.java:75)

[莫秋生]

你是在测的时候出问题了吧？nextint不能输字符串类型

[Whistleྂ]

引用 1 楼 yk3251011的回复:

你是在测的时候出问题了吧？nextint不能输字符串类型

查出问题来了，报的输入的错，但是问题出在switch--case语句中，case：后面没加break，导致所有case全部执行，从而读取输入的时候就乱了，蟹蟹大佬的帮助

[cnhxjtoa]