小白问JAVA考题

显示全部楼层 · 2009-10-20 12:40:26

public class testFinally { public static int test(){ try{
System.out.println("try"); }catch(Exception exp){
System.out.println("catch");
return 0; }finally{
System.out.println("finally"); } System.out.println("after finally"); return 1; } public static void main(String[] args) { System.out.println(test()); } } 运行结果： try finally after finally 1 结论1：当try里面的代码没有异常的时候，会执行该try块对应的finally块，并继续执行finally之后的代码 public class testFinally { public static int test(){ try{
System.out.println("try");
int i = 0;
int r = 7/i; }catch(Exception exp){
System.out.println("catch");
return 0; }finally{
System.out.println("finally");
//return 2; } System.out.println("after finally"); return 1; } public static void main(String[] args) { System.out.println(test()); } } 运行结果： try catch finally 0 结论2：当try里面的代码出现异常的时候，会执行该try块对应的catch块和finally块，且即使catch中有返回finally也是要执行。法调用是执行完finally中的语句，再返回catch中的return。 public class testFinally { public static int test(){ try{
System.out.println("try");
int i = 0;
int r = 7/i; }catch(Exception exp){
System.out.println("catch");
return 0; }finally{
System.out.println("finally");
return 2; } } public static void main(String[] args) { System.out.println(test()); } } 运行结果： try catch finally 2 结论3：相对于结论2，finally中如果有return的情况，那么即使catch中有return，这个return也不起作用，该方法调用要到finally中的return才返回 public class testFinally { public static int test(){ try{
System.out.println("try");
int i = 0;
int r = 7/i; }catch(Exception exp){
System.out.println("catch");
return 0; }finally{
System.out.println("finally");
return 2; } System.out.println("after finally"); return 1; } public static void main(String[] args) { System.out.println(test()); } } 编译不通过 System.out.println("after finally"); return 1; 为unreachable statement

千问 · 2009-10-20 12:40:26

you win i never

千问 · 2009-10-20 12:40:26

Iwillwin