Question

为什么我用nextInt会报错

package java.uyil;

//import java.util.Scanner;
import java.util.*;
//import java.

public class Scanner {

public static void main(String[]args){
Scanner scanner= new Scanner();

System.out.print("请输入学生年龄：");
int ageOfStudent = scanner.nextInt();
System.out.println("该生是否满18岁?"+
(ageOfStudent>=18?"yes":"no"));

}
}
package java.uyil;

//import java.util.Scanner;
import java.util.*;
//import java.

public class Test {

public static void main(String[]args){
Scanner scanner= new Scanner(System.in);

System.out.print("请输入学生年龄：");
int ageOfStudent = scanner.nextInt();
System.out.println("该生是否满18岁?"+
(ageOfStudent>=18?"yes":"no"));

}
}

Answer 1

需要修改package 里面的java， 关键字不能用在包名
Scanner scanner= new Scanner(System.in);你要输入整数才可以

package java1.a;

//import java.util.Scanner;
import java.util.*;
//import java.

public class Test {

public static void main(String[]args){
Scanner scanner= new Scanner(System.in);

System.out.print("请输入学生年龄：");
int ageOfStudent = scanner.nextInt();
System.out.println("该生是否满18岁?"+
(ageOfStudent>=18?"yes":"no"));

}
}

追问

提示编辑器不包含一个主要类型

追答

包名java1.a

你用下面这个代码吧
package java1.a;

import java.util.*;

public class Test {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);

System.out.print("Please input the age for a student:");
int ageOfStudent = scanner.nextInt();
System.out.println("Is greater than 18?"+ (ageOfStudent >= 18 ? "yes" : "no"));

}
}

Answer 2

public class Test {
public static void main(String[]args){
Scanner scanner= new Scanner(System.in);
System.out.print("请输入学生年龄：");
int ageOfStudent = scanner.nextInt();
System.out.println("该生是否满18岁?"+
(ageOfStudent>=18?"yes":"no"));

}
}

顺带注意类名

Answer 3

Scanner scanner= new Scanner(System.in);

追问

加了 Scanner scanner= new Scanner(System.in); 这条也报错啦！

追答

把你这类名改一下。。和Scanner重名了

Answer 4

Scanner scanner= new Scanner(System.in);