本文共 4360 字，大约阅读时间需要 14 分钟。

package com.zte.lzz.leetcode.tryCatchFinally;/** * try-catch-finally 执行顺序及finally修改属性值问题总结 */public class TryCatchFinallyDemo {    public static void main(String[] args) {        System.out.println(show01());        System.out.println("-----------------------------------");        System.out.println(show02());        System.out.println("-----------------------------------");        System.out.println(show03());        System.out.println("-----------------------------------");        System.out.println(show04());        System.out.println("-----------------------------------");        System.out.println(show05());        System.out.println("-----------------------------------");        TryCatchFinallyDemo demo = new TryCatchFinallyDemo();        System.out.println(demo.m1().toString());        System.out.println("-----------------------------------");        System.out.println("-----------------------------------");        System.out.println(demo.m2().toString());        System.out.println("-----------------------------------");        System.out.println(demo.m3().toString());    }    public static int show01() {        try {            return 1;        }finally{            System.out.println("finally模块被执行,01");        }    }    public static int show02() {        try {            int a = 8/0;            return 1;        }catch (Exception e) {            return 2;        }finally{            System.out.println("finally模块被执行,02");        }    }    public static int show03() {        try {            int a = 8/0;            return 1;        }catch (Exception e) {            return 2;        }finally{            System.out.println("finally模块被执行,03");            return 0;        }    }    public static int show04() {        int result = 0;        try {            return result;        }finally{            System.out.println("finally模块被执行,04");            result = 1;        }    }    public static Object show05() {        Object obj = new Object();        try {            return obj;        }finally{            System.out.println("finally模块被执行,05");            obj = null;        }    }    public LOl m1(){        LOl lOl = new LOl();        try {            return lOl;        }finally {            System.out.println("finally模块被执行,m1");            lOl = null;        }    }    public LOl m2(){        LOl lOl = new LOl();        try {            lOl.setAge(20);            lOl.setName("jack");            return lOl;        }finally {            System.out.println("finally模块被执行,m2");            lOl.setAge(25);            lOl.setName("rose");        }    }    public LOl m3(){        LOl lOl = new LOl();        try {            lOl.setAge(20);            lOl.setName("jack");            return lOl;        }finally {            System.out.println("finally模块被执行,m3");            lOl.setAge(25);            lOl.setName("rose");            return lOl;        }    }    class LOl{        private String name;        private int age;        public String getName() {            return name;        }        public void setName(String name) {            this.name = name;        }        public int getAge() {            return age;        }        public void setAge(int age) {            this.age = age;        }        @Override        public String toString() {            return "LOl{" +                    "name='" + name + '\'' +                    ", age=" + age +                    '}';        }    }}

finally模块被执行,011-----------------------------------finally模块被执行,022-----------------------------------finally模块被执行,030-----------------------------------finally模块被执行,040-----------------------------------finally模块被执行,05java.lang.Object@18769467-----------------------------------finally模块被执行,m1LOl{name='null', age=0}----------------------------------------------------------------------finally模块被执行,m2LOl{name='rose', age=25}-----------------------------------finally模块被执行,m3LOl{name='rose', age=25}Process finished with exit code 0

结果及结论：

执行顺序：

1，finally无return，执行完finally代码，再执行try或者catch里面return

2，finally有return，执行finally里面return，不再执行try或者catch里面return

finally修改值问题：

3，如果在执行finally块前出现return语句，会把在值先缓存起来，等执行完finally块后，再返回缓存起来的值。

4，如果是返回基本类型的值，那么在缓存时也是缓存值本身，所以后面在finally块中重新赋值时，方法返回的值不会受finally块中重新赋值的影响；

如果返回的是引用类型的值，那么在缓存时，缓存的是引用类型对象的引用，所以虽然后面在finally块中重新赋值时（重新指向另一个对象），方法返回的值不会受到影响，但是如果是修改对象的属性，那么会影响到返回的值。

参考博客： 与

转载地址：http://zxwci.baihongyu.com/