Eclipse调试器不会在条件断点处停止 [英] Eclipse Debugger doesn't stop at conditional breakpoint

问题描述

我在Eclipse中有要调试的Java代码.

这是代码:

 公共两次排斥(节点n1，节点n2){双倍= 0.0;rep = Math.pow(K，2)/distEuc(n1，n2);System.out.println(Répulsion:" + rep);listForcesRep.add(rep);返回代表}私人Double distEuc(节点n1，节点n2){双倍d = 0.0;Object [] n1Attributes = n1.getAttribute("xy");Double x1 =(Double)n1Attributes [0];Double y1 =(Double)n1Attributes [1];Object [] n2Attributes = n2.getAttribute("xy");Double x2 =(Double)n2Attributes [0];Double y2 =(Double)n2Attributes [1];d = Math.sqrt((Math.pow(x1-x2，2)+ Math.pow(y1-y2，2)));返回d;} 

我在以下行中切换了一个断点: rep = Math.pow(K，2)/distEuc(n1，n2); ，并且我以默认值运行了调试器，并且运行正常./p>

问题是，在某些时候， rep 变量的值是 NaN ，为了理解原因，我需要一个条件断点.

我这样设置条件断点:

但是当我运行调试时，它会跳过断点，并且循环会继续进行.

我做错了什么?我该如何解决?

谢谢！

解决方案

那是因为 rep 在该行中仍等于0.0: Double rep = 0.0;

在计算 rep 值之后，需要在 System.out.println(Répulsion:" + rep); 处放置条件断点，然后在执行停止于该行，则拖放到帧"以再次执行该方法.

您还应该使用 Double.isNaN(rep)或 rep.isNaN()，而不是 rep == Double.NaN .

I have this Java Code in Eclipse that I would like to Debug.

This is the code :

    public Double repulsion(Node n1, Node n2) {
    Double rep = 0.0;
    rep = Math.pow(K, 2) / distEuc(n1, n2);
    System.out.println("Répulsion : " + rep);
    listForcesRep.add(rep);
    return rep;
}

    private Double distEuc(Node n1, Node n2) {
    Double d = 0.0;
    Object[] n1Attributes = n1.getAttribute("xy");
    Double x1 = (Double) n1Attributes[0];
    Double y1 = (Double) n1Attributes[1];
    Object[] n2Attributes = n2.getAttribute("xy");
    Double x2 = (Double) n2Attributes[0];
    Double y2 = (Double) n2Attributes[1];
    d = Math.sqrt((Math.pow(x1 - x2, 2) + Math.pow(y1 - y2, 2)));
    return d;
}

I toggled a breakpoint at line : rep = Math.pow(K, 2) / distEuc(n1, n2); and I ran the debugger in its default values and it works fine.

The thing is that at some point the rep variable takes a value NaN and I need a conditional breakpoint in order to understand why.

I set the conditional breakpoint like this :

But when I run the debug, it skips the breakpoint and the loop keeps on going.

What did I do wrong? And how can I fix it?

Thanks!

解决方案

That's because rep is still equals to 0.0 in that line: Double rep = 0.0;

You need to put a conditional breakpoint at System.out.println("Répulsion : " + rep);, after calculating rep value, then when execution stops at that line, you "Drop to Frame" to execute again that method.

You should also use Double.isNaN(rep) or rep.isNaN() instead of rep == Double.NaN.

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