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如何为我的异常类加上 "return type"?

chuxueaihaozhe

发贴: 26
积分: 0

于 2005-07-10 23:01

public class NewPrimeFinder implements Runnable {
public long target;
public long prime;
public boolean finished = false;
private Thread runner;

NewPrimeFinder(long inTarget) throws NegativeNumberException {
if (inTarget < 0) {
NegativeNumberException nne = new NegativeNumberException(
"Negative numbers not allowed: " + inTarget);
throw nne;
}
target = inTarget;
if (runner == null) {
runner = new Thread(this);
runner.start();
}
}

public void run() {
long numPrimes = 0;
long candidate = 2;
while (numPrimes < target) {
if (isPrime(candidate)) {
numPrimes++;
prime = candidate;
}
candidate++;
}
finished = true;
}

boolean isPrime(long checkNumber) {
double root = Math.sqrt(checkNumber);
for (int i = 2; i <= root; i++) {
if (checkNumber % i == 0)
return false;
}
return true;
}
}

class NegativeNumberException extends Exception {
NegativeNumberException() {
super();
}
NegativeNumberException(String message) {
super(message);
}
}
================================
c:\>javac PrimeFinder.java
PrimeFinder.java: :invalid method declaration;return type required
NegativeNumberException()
^
PrimeFinder.java: :invalid method declaration;return type required
NegativeNumberException(String message)
^
2 errors
=================================
Why?How?Help me!Thanks!

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话题树型展开

人气	标题	作者	字数	发贴时间
6036	如何为我的异常类加上 "return type"?	chuxueaihaozhe	1678	2005-07-10 23:01
4860	Re:如何为我的异常类加上 "return type"?	why	103	2005-07-11 00:11
5006	Re:如何为我的异常类加上 "return type"?	chuxueaihaozhe	261	2005-07-11 21:26
4944	Re:如何为我的异常类加上 "return type"?	heart5	327	2005-07-15 07:46
4939	Re:如何为我的异常类加上 "return type"?	chuxueaihaozhe	64	2005-07-15 21:13
4805	Re:如何为我的异常类加上 "return type"?	why	409	2005-07-15 23:16
5238	Re:如何为我的异常类加上 "return type"?	chuxueaihaozhe	2387	2005-07-17 23:24

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