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Java 异常处理 （Exception Handling）
1. Never return in a finally statement.
If you return in a finally block then any Throwables that aren‘t caught will be completely lost.
e.g.
1 // "Done!" will be print out, but there is no "Got it." 2 public class Test { 3 public static void main(String[] args) { 4 try { 5 doSomething(); 6 System.out.println("Done!"); 7 } catch (RuntimeException e) { 8 System.out.println("Got it."); 9 }10 }11 12 public static void doSomething() {13 try {14 throw new RuntimeException();15 } finally {16 return;17 }18 }19 }
2. If return in try/catch, changes in finally will not affect return value.
finally black run before return, but the return value will be copied.
1 // print "123" 2 public class Test { 3 public static void main(String[] args) { 4 System.out.println(getString()); 5 } 6 7 public static String getString() { 8 String str = "123"; 9 try {10 throw new Exception();11 } catch (Exception e) {12 return str;13 } finally {14 str = "456";15 }16 }17 }
Java 异常处理 （Exception Handling）
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