JAVA 异常

使用try…catch

public class Test {

    public Test() {
        // TODO Auto-generated constructor stub
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            System.out.println("try start");
            int i = 1 / 0;
            System.out.println("try end");
        } catch (Exception e) {
            // TODO: handle exception
            System.out.println("catch");
            e.printStackTrace();
        } finally {
            System.out.println("finally");
        }
    }

}

运行结果

try start
catch
finally
java.lang.ArithmeticException: / by zero
    at Test.main(Test.java:12)

运行时异常

public class Test {

    public Test() {
        // TODO Auto-generated constructor stub
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub

        if (true) {
            RuntimeException e = new RuntimeException("产生异常");
            throw e;
        }

    }

}

运行结果

Exception in thread "main" java.lang.RuntimeException: 产生异常
    at Test.main(Test.java:12)

使用throws

public class Test {

    public Test() {
        // TODO Auto-generated constructor stub
    }

    public static void main(String[] args) throws Exception {
        // TODO Auto-generated method stub

        if (true) {
            Exception e = new Exception("产生异常");
            throw e;
        }

    }

}

运行结果

Exception in thread "main" java.lang.Exception: 产生异常
    at Test.main(Test.java:12)