Java趣味分享：try/finally
考虑以下四个测试方法，它们会输出什么？
public class Test {
public static void main(String[] args) {
System.out.println(test1());
System.out.println(test2());
System.out.println(test3());
System.out.println(test4());
}
private static int test1() {
int i = 1;
try {
return i;
} catch (Exception e) {
e.printStackTrace();
} finally {
i = 0;
}
return i;
}
private static int test2() {
int i = 1;
try {
return i;
} catch (Exception e) {
e.printStackTrace();
} finally {
i = 0;
return i;
}
}
private static User test3() {
User user = new User("u1");
try {
return user;
} catch (Exception e) {
e.printStackTrace();
} finally {
user = new User("u2");
}
return null;
}
private static User test4() {
User user = new User("u1");
try {
return user;
} catch (Exception e) {
e.printStackTrace();
} finally {
user.setName("u2");
}
return null;
}
}
public class User {
public User(String name) {
this.name = name;
}
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return name;
}
}
答案如下：
1
0
u1
u2
结论 1、不管try,finally都会执行； 2、在try中return，在finally执行前会把结果保存起来，即使在finally中有修改也以try中保存的值为准，但如果是引用类型，修改的属性会以finally修改后的为准； 3、如果try/finally都有return，直接返回finally中的return。