70 lines
2.0 KiB
Java
70 lines
2.0 KiB
Java
// exceptions/ExtraFeatures.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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// Further embellishment of exception classes
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class MyException2 extends Exception {
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private int x;
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public MyException2() {}
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public MyException2(String msg) { super(msg); }
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public MyException2(String msg, int x) {
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super(msg);
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this.x = x;
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}
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public int val() { return x; }
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@Override
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public String getMessage() {
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return "Detail Message: "+ x
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+ " "+ super.getMessage();
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}
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}
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public class ExtraFeatures {
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public static void f() throws MyException2 {
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System.out.println("Throwing MyException2 from f()");
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throw new MyException2();
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}
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public static void g() throws MyException2 {
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System.out.println("Throwing MyException2 from g()");
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throw new MyException2("Originated in g()");
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}
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public static void h() throws MyException2 {
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System.out.println("Throwing MyException2 from h()");
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throw new MyException2("Originated in h()", 47);
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}
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public static void main(String[] args) {
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try {
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f();
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} catch(MyException2 e) {
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e.printStackTrace(System.out);
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}
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try {
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g();
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} catch(MyException2 e) {
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e.printStackTrace(System.out);
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}
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try {
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h();
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} catch(MyException2 e) {
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e.printStackTrace(System.out);
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System.out.println("e.val() = " + e.val());
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}
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}
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}
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/* Output:
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Throwing MyException2 from f()
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MyException2: Detail Message: 0 null
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at ExtraFeatures.f(ExtraFeatures.java:23)
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at ExtraFeatures.main(ExtraFeatures.java:35)
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Throwing MyException2 from g()
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MyException2: Detail Message: 0 Originated in g()
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at ExtraFeatures.g(ExtraFeatures.java:27)
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at ExtraFeatures.main(ExtraFeatures.java:40)
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Throwing MyException2 from h()
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MyException2: Detail Message: 47 Originated in h()
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at ExtraFeatures.h(ExtraFeatures.java:31)
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at ExtraFeatures.main(ExtraFeatures.java:45)
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e.val() = 47
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*/
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