public class TestInfo { private static String str =null; public static void main(String[] args) { System.out.println("test exception"); try { if(str.equals("name")){ System.out.println("test exception"); } } catch (Exception e) { System.out.println(e.toString()); System.out.println(e.getMessage()); } } }
java.lang.NullPointerException
nulljava
public class TestInfo { private static int m = 0; public static void main(String[] args) { System.out.println("test exception"); try { m = 899/0; } catch (Exception e) { System.out.println(e.toString()); System.out.println(e.getMessage()); } } }
java.lang.ArithmeticException: / by zero
/ by zero.net
e.toString()
: 得到異常種類和錯誤信息e.getMessage()
:得到錯誤信息e.printStackTrace()
:在控制檯打印出異常種類,錯誤信息和出錯位置等