提防toString递归问题

看这个代码：

public class D
{
    @Override
    public String toString()
    {
        return "obj:"+this;
    }
    public static void main(String[] args)
    {
        System.out.println(new D());
    }
}

Exception in thread "main" java.lang.StackOverflowError
    at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:113)
    at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:415)
...

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提防toString递归问题

原文：http://blog.csdn.net/chdjj/article/details/25884565