Java开发 - 异常 - 抛出异常

问题： 如何抛出一个系统异常并且捕获它

代码如下：

public class ThrowDemo {
	static void demoproc() {
		try {
			throw new NullPointerException("demo");
		} catch (NullPointerException e) {
			System.out.println("Caught inside demoproc.");
			throw e; // rethrow the exception
		}
	}

	public static void main(String args[]) {
		try {
			demoproc();
		} catch (NullPointerException e) {
			System.out.println("Recaught: " + e);
		}
	}
}

运行结果：

Caught inside demoproc.
Recaught: java.lang.NullPointerException: demo