try , catch , finally , throw , throws
package exception; public class Test { public static void main(String[] args) { int a = 1; int b = 0; try{//try 监控区域 System.out.println(a/b); }catch (ArithmeticException e){//catch 捕获异常 System.out.println("程序出现异常,b不能为0"); }finally {// 处理善后工作 System.out.println("finally"); } //finally 可以不要finally, 用: 假设IO,资源需要关闭 } } --------------------------------------------------------------------------------------------------- // 选中要要监控的代码语句 快捷键: ctrl + alt + t package exception; public class Test { public static void main(String[] args) { int a = 1; int b = 0; // 假设要捕获多个异常: 异常类型:从小到大 try{//try 监控区域 System.out.println(a/b); }catch (Error e){//catch(想要捕获的异常类型!) 捕获异常 System.out.println("Error"); }catch (Exception e){ System.out.println("Exception"); }catch (Throwable t){ System.out.println("Throwable"); } finally {// 处理善后工作 System.out.println("finally"); } //finally 可以不要finally, 用: 假设IO,资源需要关闭 } }
package exception; public class Test { public static void main(String[] args) { new Test().test(1,0); } public void test(int a , int b){ if(b==0){// throw throws throw new ArithmeticException();//主动抛出异常,一般在方法中使用 throw } System.out.println(a/b); } } --------------------- package exception; public class Test { public static void main(String[] args) { try { new Test().test(1,0); // try catch } catch (ArithmeticException e) { e.printStackTrace(); } } // 假设这个方法中,处理不了这个异常。方法上抛出异常 public void test(int a , int b) throws ArithmeticException{ // throws if(b==0){// throw throws throw new ArithmeticException();//主动抛出异常,一般在方法中使用 } System.out.println(a/b); } }
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