return、finally

1.try和catch中有return时，finally先执行

public class tryDemo {
    public static int show() {
        try {
            return 1;
        }finally{
            System.out.println("finally模块被执行");
        }
    }
    public static void main(String args[]) {
        System.out.println(show());
    }
}
----------
finally模块被执行
1

public class tryDemo {
    public static int show() {
        try {
            int a = 8/0;
            return 1;
        }catch (Exception e) {
            return 2;
        }finally{
            System.out.println("finally模块被执行");
        }
    }
    public static void main(String args[]) {
        System.out.println(show());
    }
}
------------
finally模块被执行
2

2.如果finally也有return，直接return

public class tryDemo {
    public static int show() {
        try {
            int a = 8/0;
            return 1;
        }catch (Exception e) {
            return 2;
        }finally{
            System.out.println("finally模块被执行");
            return 0;
        }
    }
    public static void main(String args[]) {
        System.out.println(show());
    }
}
-------------
finally模块被执行
0

3.finally中对于返回变量做的改变->会影响最终的返回结果

public class Test {
    public Object show1() {
        Peo obj = new Peo();
        obj.setName("1");
        try {
            System.out.println(obj);
            return obj;
        } finally {
            System.out.println("finally模块被执行");
            obj.setName("2");
        }
    }

    public Object show2() {
        Peo obj = new Peo();
        obj.setName("1");
        try {
            System.out.println(obj);
            return obj;
        } finally {
            System.out.println("finally模块被执行");
            obj = null;
        }
    }

    public Object show3() {
        Peo obj = new Peo();
        obj.setName("1");
        try {
            System.out.println(obj);
            return obj;
        } finally {
            System.out.println("finally模块被执行");
            obj = null;
            return obj;
        }
    }

    public static void main(String args[]) {
        Test test = new Test();
        System.out.println(test.show1());
        System.out.println("*************");
        System.out.println(test.show2());
        System.out.println("*************");
        System.out.println(test.show3());
    }

    class Peo {
        String name;

        public void setName(String name) {
            this.name = name;
        }

        @Override
        public String toString() {
            return "Peo [name=" + name + "]";
        }
    }
}
--------------------
Peo [name=1]
finally模块被执行
Peo [name=2]
*************
Peo [name=1]
finally模块被执行
Peo [name=1]
*************
Peo [name=1]
finally模块被执行
null