java中处理异常情况的方式_java中异常处理的几种方式

package com.eric.exception;

public class RethrowException {

public static void main(String[] args) {

try {

// g0();

// g1();

// g2();

// g3();

g6();

} catch (Exception e) {

System.out.println("##CAUSE Message:###" + e.getMessage());

e.printStackTrace();

}

}

/*

* method f() exception was caugth by g4() method::exception chaining

* exception was caugth by g5() method::exception chaining

* com.eric.exception.RethrowException$Test2Exception at

* com.eric.exception.RethrowException.g5(RethrowException.java:32) at

* com.eric.exception.RethrowException.g6(RethrowException.java:21) at

* com.eric.exception.RethrowException.main(RethrowException.java:11) Caused

* by: com.eric.exception.RethrowException$Test2Exception at

* com.eric.exception.RethrowException.g4(RethrowException.java:43) at

* com.eric.exception.RethrowException.g5(RethrowException.java:29) ... 2

* more Caused by: com.eric.exception.RethrowException$Test1Exception:

* #############ERROR############## at

* com.eric.exception.RethrowException.f(RethrowException.java:125) at

* com.eric.exception.RethrowException.g4(RethrowException.java:40) ... 3

* more

*/

public static void g6() throws Test2Exception {

try {

g5();

} catch (Test2Exception e) {

throw e;

}

}

public static void g5() throws Test2Exception {

try {

g4();

} catch (Test2Exception e) {

System.out.println("exception was caugth by g5() method::exception chaining");

RethrowException.Test2Exception t2 = new RethrowException().new Test2Exception();

t2.initCause(e);

throw t2;

}

}

public static void g4() throws Test2Exception {

try {

f();

} catch (Test1Exception e) {

System.out.println("exception was caugth by g4() method::exception chaining");

RethrowException.Test2Exception t2 = new RethrowException().new Test2Exception();

t2.initCause(e);

throw t2;

}

}

/*

* method f() exception was caugth by g1() method

* com.eric.exception.RethrowException$Test1Exception:

* #############ERROR############## at

* com.eric.exception.RethrowException.f(RethrowException.java:78) at

* com.eric.exception.RethrowException.g1(RethrowException.java:49) at

* com.eric.exception.RethrowException.main(RethrowException.java:7)

*/

public static void g1() throws Test1Exception {

try {

f();

} catch (Test1Exception e) {

System.out.println("exception was caugth by g1() method");

throw e;

}

}

/*

* 原始的異常信息將丟失

*

* method f() exception was caugth by g2() method::use fillInstackTrace

* method com.eric.exception.RethrowException$Test1Exception:

* #############ERROR############## at

* com.eric.exception.RethrowException.g2(RethrowException.java:69) at

* com.eric.exception.RethrowException.main(RethrowException.java:8)

*/

public static void g2() throws Exception {

try {

f();

} catch (Test1Exception e) {

System.out.println("exception was caugth by g2() method::use fillInstackTrace method");

throw (Exception) e.fillInStackTrace();

}

}

/*

* 原始的異常信息將丟失

*

* method f() exception was caugth by g3() method::change exception object

* com.eric.exception.RethrowException$Test2Exception: rethrow by t2 at

* com.eric.exception.RethrowException.g3(RethrowException.java:86) at

* com.eric.exception.RethrowException.main(RethrowException.java:9)

*/

public static void g3() throws Exception {

try {

f();

} catch (Test1Exception e) {

System.out.println("exception was caugth by g3() method::change exception object");

// e.printStackTrace();

RethrowException.Test2Exception t2 = new RethrowException().new Test2Exception("rethrow by g3");

throw t2;

}

}

/*

* 通过initCause()方法，把原始的异常堆栈信息保存下来。 下面的异常信息中包含了原始的異常信息

* RethrowException.f(RethrowException.java:125)

*

*

* method f() com.eric.exception.RethrowException$Test2Exception: rethrow by

* g0 at com.eric.exception.RethrowException.g0(RethrowException.java:117)

* at com.eric.exception.RethrowException.main(RethrowException.java:10)

* Caused by: com.eric.exception.RethrowException$Test1Exception:

* #############ERROR############## at

* com.eric.exception.RethrowException.f(RethrowException.java:125) at

* com.eric.exception.RethrowException.g0(RethrowException.java:113) ... 1

* more exception was caugth by g0() method::change exception object

*/

public static void g0() throws Exception {

try {

f();

} catch (Test1Exception e) {

System.out.println("exception was caugth by g0() method::change exception object");

// e.printStackTrace();

RethrowException.Test2Exception t2 = new RethrowException().new Test2Exception("rethrow by g0");

t2.initCause(e);

throw t2;

}

}

public static void f() throws Test1Exception {

System.out.println("method f()");

throw new RethrowException().new Test1Exception("#############ERROR##############");

}

class Test1Exception extends Exception {

private static final longserialVersionUID= -2656978134207266579L;

public Test1Exception(String message) {

super(message);

}

}

class Test2Exception extends Exception {

private static final longserialVersionUID= -4063317779983989554L;

private String msg;

public Test2Exception() {}

public Test2Exception(String msg) {

super(msg);

this.msg = msg;

}

}

}