为什么我收到以下代码的错误；

Question

这是我收到错误的程序：

// 导入扫描仪 Class 导入 java.util.Scanner;

// creating ClassStudent1
class ClassStudent1 {

    // creating instance variable for ClassStudent1 class
    int id;
    String name;

}

// creating another class in which main() will be present
class Student2{

    // creating main() method
    public static void main(String[] args) {

        // creating Scanner Class object
        Scanner sc=new Scanner(System.in);

        // creating ClassStudent1 object
        ClassStudent stu = new ClassStudent();

        // asigning value to the ClassStudent1 object stu
        stu.name="jay";
        stu.id=1023;

        // printing the value which is asign to the object
        System.out.println(stu.id);
        System.out.println(stu.name);

        // asigning value to the Scanner Class object
        System.out.println("enter your name");
        String b=sc.nextLine();

        System.out.println("enter your id");
        int a=sc.nextInt();

        stu.id = a;
        stu.name = b;

       System.out.println("your id is:",a);
      //  System.out.println("your name is:",b);

        System.out.println(a);
        System.out.println(b);
    }
}

这些是我得到的错误：

java: no suitable method found for println(java.lang.String,int)
    method java.io.PrintStream.println() is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(boolean) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(char) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(int) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(long) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(float) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(double) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(char[]) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(java.lang.String) is not applicable
      (actual and formal argument lists differ in length)
    method java.io.PrintStream.println(java.lang.Object) is not applicable
      (actual and formal argument lists differ in length)

Answer 1

您的错误在这一行：

System.out.println("your id is:",+a);

查看此链接以了解如何使用 println