publid class E { public static void main(String[] args) { System.out.print("E"); } } public class A { public static void main(String[] args) { System.out.print("A"); } }源文件为什么错

这个源文件有两个类，但是只能有一个 public 类。其中一个类需要被声明为 public，另一个则不需要。你需要将其中一个类的 public 声明去掉，或者将其移到另一个源文件中。例如：

E.java 文件：

public class E {
    public static void main(String[] args) {
        System.out.print("E");
    }
}

A.java 文件：

public class A {
    public static void main(String[] args) {
        System.out.print("A");
    }
}

相关问题

What is the output of the following code? ( ) public class rtExcept{ public static void throwit0{ System.out.print("throwit "); throw new RuntimeException0; } public static void main(String I aa){ try { System.out print("hello "); throwitO;} catch(Exception re){ System.out.print("caught "); } finally System.out.print("finally "); ' System.out print("after ");｝｝

The code contains compilation errors. The correct code is:

public class rtExcept {
    public static void throwit() {
        System.out.print("throwit ");
        throw new RuntimeException();
    }

    public static void main(String[] args) {
        try {
            System.out.print("hello ");
            throwit();
        } catch (Exception re) {
            System.out.print("caught ");
        } finally {
            System.out.print("finally ");
        }
        System.out.print("after ");
    }
}

The output of the corrected code is:

hello throwit caught finally

import java.util.Scanner; public class StudyLab { public static void main (String [] args) { Scanner scnr = new Scanner(System.in); printSomething(scnr.nextLine()); } // 补全以下函数定义 public static void main (String toPrint){ System.out.println(toPrint); } }

这是一段Java代码。它在主函数中创建了一个Scanner对象scnr，并使用scnr.nextLine()读取用户输入。然后调用printSomething()函数，将读取到的输入作为参数传入。

在printSomething()函数中，没有实现，需要补全代码，
添加一个参数toPrint,并在函数内部使用System.out.println()打印toPrint参数即可

public static void main (String toPrint){
System.out.println(toPrint);
}

补全后的代码如下

import java.util.Scanner;
public class StudyLab {
public static void main (String [] args) {
Scanner scnr = new Scanner(System.in);
printSomething(scnr.nextLine());
}
public static void printSomething (String toPrint){
System.out.println(toPrint);
}
}