关于java中final关键字的使用方法详解

//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;