Java运行程序

Question

这是一个非常简单的程序。 我已经创建了一个新类，我将定义一个新方法来调用下一个新类

public class MyClass {

    public static void main(String[] args) {
        int number = 1;
        public void showSomething(){
            System.out.println("This is my method "+number+" created by me.");
        }

    }
}

但是，当我运行这个程序时，我遇到了一个错误：

Exception in thread "main" java.lang.Error: Unresolved compilation problems: 
    Syntax error on token(s), misplaced construct(s)
    Syntax error on token "void", @ expected

Answer 1

错误是因为您在另一个方法中声明了一个方法，它是main()

改变这一点：

public static void main(String[] args) {
    int number = 1;
    public void showSomething(){
        System.out.println("This is my method "+number+" created by me.");
    }

}

到

public static void main(String[] args) {
    int number = 1;
    showSomething(); // call the method showSomething()
}
public static void showSomething(){
    System.out.println("This is my method "+number+" created by me.");
}

而且showSomething()应该声明为static，因为main()是static。只能从另一个static method调用static methods

Answer 2

你不能在你的main中创建一个方法。 而是这样做：

public class MyClass {

    public static void main(String[] args) {
        showSomething();//this calls showSomething

    }

    public void showSomething(){
        int number = 1;
        System.out.println("This is my method "+number+" created by me.");
    }
}

在你的课堂上，你有一个运行程序的主方法。在同一级别上，您还有其他要在程序中使用的方法或变量

Answer 3

public class MyClass {

    public static void main(String[] args) {
        int number = 1;
        showSomething(number
    }

    public void showSomething(int number){
        System.out.println("This is my method "+number+" created by me.");
    }
}

Answer 4

应该是这样的（定义主方法之外的方法）

public class MyClass {


    public static void showSomething(int number){
            System.out.println("This is my method "+number+" created by me.");
    }

    public static void main(String[] args) {
        int number = 1;
        showSomething(number);
    }
}

Answer 5

public class MyClass {

public static void main(String[] args) {
    new MyClass().showSomething();
}

public void showSomething(){
        int number = 1;
        System.out.println("This is my method "+number+" created by me.");
}

}

Answer 6

不能将方法声明为方法

这样做：

public class MyClass {

  public static void main(String[] args) {
    int number = 1;
    showSomething(number);
  }

  public static void showSomething(int number){
    System.out.println("This is my method "+number+" created by me.");
  }
}