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参考博客
没有异常发生时
public class ReturnDemo {
public static void main(String[] args) {
// 为了方便看,我把每个方法的输出,以及返回值,放在了方法上面
System.out.println(method1());
System.out.println("--->");
System.out.println(method2());
System.out.println("--->");
System.out.println(method3());
System.out.println("--->");
}
// num is 10
// finally
// 2
private static int method1() {
try {
int a = 10 / 1;
System.out.println("num is " + a);
return 0;
} catch (Exception e) {
System.out.println("catch");
return 1;
} finally {
System.out.println("finally");
return 2;
}
// 只要catch块或者finally块中有return语句,这里就不能写return
// return 3;
}
// num is 10
// finally
// 0
private static int method2() {
try {
int a = 10 / 1;
System.out.println("num is " + a);
return 0;
} catch (Exception e) {
System.out.println("catch");
return 1;
} finally {
System.out.println("finally");
}
}
// num is 10
// finally
// 0
private static int method3() {
try {
int a = 10 / 1;
System.out.println("num is " + a);
return 0;
} catch (Exception e) {
System.out.println("catch");
} finally {
System.out.println("finally");
}
// 当catch块或者finally块没有return时,最后必须有return
return 3;
}
}
没有异常发生时,优先级依次为finally->try
当发生异常时
public class ReturnDemo {
public static void main(String[] args) {
System.out.println(method1());
System.out.println("--->");
System.out.println(method2());
System.out.println("--->");
// catch
// finally
// 3
System.out.println(method3());
System.out.println("--->");
}
private static int method1() {
try {
int a = 10 / 0;
System.out.println("num is " + a);
return 0;
} catch (Exception e) {
System.out.println("catch");
return 1;
} finally {
System.out.println("finally");
return 2;
}
// 只要catch块或者finally块中有return语句,这里就不能写return
// return 3;
}
// catch
// finally
// 1
private static int method2() {
try {
int a = 10 / 0;
System.out.println("num is " + a);
return 0;
} catch (Exception e) {
System.out.println("catch");
return 1;
} finally {
System.out.println("finally");
}
}
// catch
// finally
// 2
private static int method3() {
try {
int a = 10 / 0;
System.out.println("num is " + a);
return 0;
} catch (Exception e) {
System.out.println("catch");
} finally {
System.out.println("finally");
}
// 当catch块或者finally块没有return时,最后必须有return
return 3;
}
}
可以看到有异常发生时,优先级依次为finally->catch->捕获异常块最外面的return