Java exception catching explanation

Today, I learned the try-catch-finally statement, which I thought was quite simple and easy to understand. I searched for a related type of question. As a result, confidence was poured cold water on. Mark the questions first and go out for some fresh air.

 1 public class TestEx { 2     private int c; 3  4     public TestEx() { 5     } 6  7     @SuppressWarnings("finally") 8     boolean testEx() throws Exception { 9         boolean ret = true;10         try {11             ret = testEx1();12         } catch (Exception e) {13             System.out.println("testEx, catch exception");14             ret = false;15             throw e;16         } finally {17             System.out.println("testEx, finally; return value=" + ret);18             return ret;19         }20     }21 22     @SuppressWarnings("finally")23     boolean testEx1() throws Exception {24         boolean ret = true;25         try {26             ret = testEx2();27             if (!ret) {28                 return false;29             }30             System.out.println("testEx1, at the end of try");31             return ret;32         } catch (Exception e) {33             System.out.println("testEx1, catch exception");34             ret = false;35             throw e;36         } finally {37             System.out.println("testEx1, finally; return value=" + ret);38             return ret;39         }40     }41 42     @SuppressWarnings("finally")43     boolean testEx2() throws Exception {44         boolean ret = true;45         try {46             int b = 12;47             for (int i = 2; i >= -2; i--) {48                 setC(b / i);49                 System.out.println("i=" + i);50             }51             return true;52         } catch (Exception e) {53             System.out.println("testEx2, catch exception");54             ret = false;55             throw e;56         } finally {57             System.out.println("testEx2, finally; return value=" + ret);58             return ret;59         }60     }61 62     public static void main(String[] args) {63         TestEx testException1 = new TestEx();64         try {65             testException1.testEx();66         } catch (Exception e) {67             e.printStackTrace();68         }69     }70 71     public int getC() {72         return c;73     }74 75     public void setC(int c) {76         this.c = c;77     }78 }

Output:

After reading this, I was thinking,

1.Java exception handling mechanism , do I really understand?

2.Java exception handling, have I really mastered it?

3. How to deal with return in the catch body?

4.How to deal with return in finally body?

5. What should I do if return is encountered in catch and finally at the same time?

6. Is there another System.exit()? What to do if you encounter it? ?

7. Just knowing throws is not a complete solution, you need to continue to understand it in depth.

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