Java에서 final 키워드를 사용하는 방법에 대한 자세한 설명

//父类Animal public final class Animal{ private int age; //年龄 private String var; //品种 public void eat(){ System.out.println("吃东西"); } } //子类cat public class cat extends Animal{ //编译时会报错，编译不通过。 public void eat(){ System.out.println("吃鱼"); } }

//父类Animal public class Animal{ private int age; //年龄 private String var; //品种 public final void eat(){ //成员方法 System.out.println("吃东西"); } } //子类cat public cat extends Animal{ public void eat(){ //重写父类方法。编译时会报错，编译不通过。 System.out.println("吃鱼"); } }

public class Animal{ public static void main(String str){ private int i = 10; i = 20; //编译时，此处报错。 System.out.println(i); } }

public class Animal{ public static void main(String str){ final Cat c; c = new Cat(); c = new Cat(); } } public class Cat{ private String var; private int age; public void eat(){ System.out.println("吃鱼"); } }

格式：public static final int I = 10;