/* 自定义异常 1、继承exception类 2、定义自定义类的构造函数(实参),super(name);相当于使用父类的构造方法; */ import java.io.*; class DivisorIsZeroException extends Exception { public DivisorIsZeroException(String name) { super(name); } } class A { public int divide(int a, int b) throws DivisorIsZeroException { int m = 0; if (0 == b) throw new DivisorIsZeroException("除数不能为零!");//看到throws里面定义自己需要对其用throw处理 else m = a/b; return m; } } public class TestExcep { public static void main(String[] args) throws IOException { A aa = new A(); try //看到throws 调用方法时中try catch处理异常 { aa.divide(6, 0); } catch (Exception e) { e.printStackTrace(); } } }