Why you need to use exceptions with caution in Java

Use exceptions with caution

In Java software development, try-catch is often used to capture errors. However, the try-catch statement is very bad for system performance. Although the performance loss caused by try-catch cannot be detected in a try-catch, once try-catch is applied to a loop, it will cause great damage to system performance.

The following is an example of applying try-catch inside a for loop

public void test() {                int a = 0;                for (int i = 0; i < 1000000; i++) {                         try {                 a = a + 1;                 System.out.println(i);             } catch (Exception e) {                 e.printStackTrace();             }         }     }

The running time of this code is 27211 ms. If try-catch is moved outside the loop, system performance can be improved. The following code

public void test() {             int a = 0;                 try {                         for (int i = 0; i < 1000000; i++) {                 a = a + 1;                 System.out.println(i);             }         } catch (Exception e) {             e.printStackTrace();         }     }

takes 15647 ms to run. It can be seen the impact of tyr-catch on system performance.

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