Java-variable scope (two)

Variables in Java must be defined in a pair of braces, and the code area contained in the braces is the scope of this variable.

• The global scope can be accessed in the local scope

package JavaClass;

public class _01作用域 {
    
    
    public static void main(String[] args) {
    
    
        {
    
    
            int a=0;
            System.out.println(a);
        }
        System.out.println(a);
    }
}

operation result

• The variable name in the brackets cannot be the same as the variable name in the main function

package JavaClass;

public class _01作用域 {
    
    
    public static void main(String[] args) {
    
    
        int a = 10;
        {
    
    
            int a=0;
            System.out.println(a);
        }
        System.out.println(a);
    }
}

Running results:

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