Detailed explanation of the differences between final, finally and finalize

This article mainly introduces the relevant information on the differences between final, finally and finalize in the basics of java. Friends in need can refer to it

The differences between final, finally and finalize in the basics of java

1.final can modify the class, but cannot be inherited; it can modify the method, but cannot be overridden; it can modify the variable, but can only be assigned once.

2.finally is the statement body in the try statement, which cannot be used alone and is used to release resources;

3.finalize is a method , this method is called by the object's garbage collector when the garbage collector determines that there are no more references to the object.

The following code program:

package cn.jit.test; 
/** 
 * 面试题1：final,finally和finalize的区别: 
 * 
 * final可以修饰类，不能被继承; 
 *   可以修饰方法，不能被重写 
 *   可以修饰变量，只能赋值一次。 
 * finally是try语句中的语句体，不能单独使用，用来释放资源; 
 * finalize是一个方法，当垃圾回收器确定不存在对该对象的更多引用时，由对象 
 * 的垃圾回收器调用此方法。 
 * 
 * 
 * 面试题2：如果catch里面有return语句，请问finally的代码还会被执行吗？ 
 * 如果会，请问是在return前还是在return后？ 
 * 会。在return前。 
 * 
 * @author Rocky 
 * 
 */ 
public class FinallyDemo8 { 
  public static void main(String[] args) { 
    Demo d = new Demo(); 
    System.out.println(d.method()); 
  } 
} 
class Demo { 
  public int method() { 
    int x = 10; 
    try { 
      x = 20; 
      System.out.println(1/0); 
      return x; 
    } catch (Exception e) { 
      x = 30; 
      return x; 
    } finally { 
      /* 
       * finally中不应当有return语句 
       * 否则该方法一定会返回这里的内容 
       */ 
      x = 40; 
      return 40; 
      //千万不要在finally里面写返回语句，因为finally的作用是 
      //释放资源，是肯定会执行的，如果在这里面写返回语句，那么try和cache 
      //的结果都会被改变，所以这么写就是犯罪！！！ 
    } 
     
  } 
}

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