nestedexception.java

高质量Java程序设计 源代码

package net.betterjava.exception.nestedexception;
import java.io.PrintStream;
import java.io.PrintWriter;

public class NestedException extends Exception {
	private Exception oldExp;

	public NestedException(String msg) {
		throw new UnsupportedOperationException();
	}

	public NestedException(Exception e) {
		super(e.getMessage());
		oldExp = e;
	}

	public void printStackTrace() {
		super.printStackTrace();
		if (oldExp != null) {
			System.err.println("Nested Exception: ");
			oldExp.printStackTrace();
		}
	}
	public void printStackTrace(PrintStream ps) {
		super.printStackTrace(ps);
		if (oldExp != null) {
			ps.println("Nested Exception: ");
			oldExp.printStackTrace(ps);
		}
	}
	public void printStackTrace(PrintWriter pw) {
		super.printStackTrace(pw);
		if (oldExp != null) {
			pw.println("Nested Exception: ");
			oldExp.printStackTrace(pw);
		}
	}
}