实例 Java 创建最终变量(不可更改且只读)

x
 
public class Main {
  public static void main(String[] args) {
    final int myNum = 15;
    myNum = 20; // will generate an error
    System.out.println(myNum);
  }
}
                    

输出结果

Main.java:4: error: cannot assign a value to final variable myNum
    myNum = 20;
         ^
1 error