1、try块中没有抛出异常，try、catch和finally块中都有return语句
public static int NoException(){int i=10;try{System.out.println(“i in try block is：”+i);return –i;}catch(Exception e){–i;System.out.println(“i in catch – form try block is：”+i);return –i;}finally{System.out.println(“i in finally – from try or catch block is：”+i);return –i;} }
运行代码：
public static void main(String[] args) {System.out.println(“=============NoException==================”);System.out.println(NoException());System.out.println(“===============================”);}
运行结果：
=============NoException==================i in try block is：10i in finally – from try or catch block is：98===============================
执行顺序：
执行try块，执行到return语句时，先执行return的语句，–i，但是不返回到main方法，执行finally块，遇到finally块中的return语句，执行–i,并将值返回到main方法，这里就不会再回去返回try块中计算得到的值。
结论：try-catch-finally都有return语句时，没有异常时，返回值是finally中的return返回的。
2.try块中没有抛出异常，仅try和catch中有return语句
public static int NoException1(){int i=10;try{System.out.println(“i in try block is：”+i);return –i;}catch(Exception e){–i;System.out.println(“i in catch – form try block is：”+i);return –i;}finally{System.out.println(“i in finally – from try or catch block is：”+i);–i;System.out.println(“i in finally block is：”+i);//return –i;}}
运行结果：
=============NoException1==================i in try block is：10i in finally – from try or catch block is：9i in finally block is：89===============================
执行顺序：
try中执行完return的语句后，不返回，执行finally块，finally块执行结束后，返回到try块中，返回i在try块中最后的值。
结论：try-catch都有return语句时，没有异常时，返回值是try中的return返回的。
3.try块中抛出异常，try、catch和finally中都有return语句
public static int WithException(){int i=10;try{System.out.println(“i in try block is：”+i);i = i/0;return –i;}catch(Exception e){System.out.println(“i in catch – form try block is：”+i);–i;System.out.println(“i in catch block is：”+i);return –i;}finally{System.out.println(“i in finally – from try or catch block is–“+i);–i;System.out.println(“i in finally block is–“+i);return –i;}}
执行结果：
=============WithException==================i in try block is：10i in catch – form try block is：10i in catch block is：9i in finally – from try or catch block is–8i in finally block is–76===============================
执行顺序：
抛出异常后，执行catch块，在catch块的return的–i执行完后，并不直接返回而是执行finally，因finally中有return语句，所以，执行，返回结果6。
结论：
try块中抛出异常，try、catch和finally中都有return语句，返回值是finally中的return。
4.try块中抛出异常，try和catch中都有return语句
public static int WithException1(){int i=10;try{System.out.println(“i in try block is：”+i);i=i/0;return –i;}catch(Exception e){System.out.println(“i in catch – form try block is：”+i);return –i;}finally{System.out.println(“i in finally – from try or catch block is：”+i);–i;System.out.println(“i in finally block is：”+i);//return i;}}
执行结果：
=============WithException1==================i in try block is：10i in catch – form try block is：10i in finally – from try or catch block is：9i in finally block is：89===============================
执行顺序：
抛出异常后，执行catch块，，执行完finally语句后，依旧返回catch中的执行return语句后的值，而不是finally中修改的值。
结论：
返回的catch中return值。
5.try、catch中都出现异常，在finally中有返回
public static int WithException2(){int i=10;try{System.out.println(“i in try block is：”+i);i=i/0;return –i;}catch(Exception e){System.out.println(“i in catch – form try block is：”+i);int j = i/0;return –i;}finally{System.out.println(“i in finally – from try or catch block is：”+i);–i;–i;System.out.println(“i in finally block is：”+i);return –i;}
执行结果：
=============WithException2==================i in try block is：10i in catch – form try block is：10i in finally – from try or catch block is：10i in finally block is：87===============================
执行顺序：
try块中出现异常到catch，catch中出现异常到finally，finally中执行到return语句返回，不检查异常。
结论：
返回finally中return值。
6、只在函数最后出现return语句
public static int WithException3(){int i=10;try{System.out.println(“i in try block is：”+i);i=i/0;//return –i;}catch(Exception e){System.out.println(“i in catch – form try block is：”+i);//int j = i/0;//return –i;}finally{System.out.println(“i in finally – from try or catch block is：”+i);–i;–i;System.out.println(“i in finally block is：”+i);//return –i;}return –i;}一旦有了意志，脚步也会轻松起来。
