深入理解finally关键字,Finally到底是在return前面执行还是在return后面执行

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<h1>一：2种finally不会执行的情况</h1>
　　a.在try语句之前就return了
　　b.try语句中有System.exit();语句
<h1>二：finally语句在return执行之后，return返回之前执行</h1>
　　例1：
<div class="cnblogs_code">
 <pre class="blockcode">public class FinallyTest1 {
public static void main(String[] args) {
 test1();
}
public static int test1(){
 int b=20;
 try {
 System.out.println("try block");
 return b += 80;
 }
 catch (Exception e) {
 System.out.println("catch block");
 }
 finally {
 System.out.println("finally block");
 if (b > 25) {
 System.out.println("b>25, b = " + b);
 }
 }
 return b;
}
}</pre>
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console:
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 <img alt="" class="code_img_closed" id="code_img_closed_a71ea1ac-36a9-4898-a488-f367cb0373fd" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-8f900a89c6347c561fdf2122f13be562.gif">
 <img alt="" class="code_img_opened" id="code_img_opened_a71ea1ac-36a9-4898-a488-f367cb0373fd" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-961ddebeb323a10fe0623af514929fc1.gif">
 <div class="cnblogs_code_hide" id="cnblogs_code_open_a71ea1ac-36a9-4898-a488-f367cb0373fd">
<pre class="blockcode">try block
finally block
b>25, b = 100</pre>
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说明：在return b += 80;后先执行finally语句
再来一个例子加强这个事实
例2
<div class="cnblogs_code">
 <pre class="blockcode">public class FinallyTest1 {
public static void main(String[] args) {
 System.out.println(test11());
}
public static String test11() {
 try {
 System.out.println("try block");
 return test12();
 } finally {
 System.out.println("finally block");
 }
}
public static String test12() {
 System.out.println("return statement");
 return "after return";
}
}</pre>
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console:
<div class="cnblogs_code">
 <img alt="" class="code_img_closed" id="code_img_closed_5465cfa4-a07d-4efe-8320-574ed447e3f8" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-8f900a89c6347c561fdf2122f13be562.gif">
 <img alt="" class="code_img_opened" id="code_img_opened_5465cfa4-a07d-4efe-8320-574ed447e3f8" src="https://beijingoptbbs.oss-cn-beijing.aliyuncs.com/cs/5606289-961ddebeb323a10fe0623af514929fc1.gif">
 <div class="cnblogs_code_hide" id="cnblogs_code_open_5465cfa4-a07d-4efe-8320-574ed447e3f8">
<pre class="blockcode">try block
return statement
finally block
after return</pre>
 </div>
 View Co