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分享这道题选什么？？？？
.Given the following fragment of code:
Double d1 = new Double(1.0);
Double d2 = new Double(1.0);
Float f = new Float(1.0F);
Which results of the following expressions are true?
A. d1 == d2
B. d1.equals(d2)
C. d1 = f
D. f.equals(d1)
Double d1 = new Double(1.0);
Double d2 = new Double(1.0);
Float f = new Float(1.0F);
Which results of the following expressions are true?
A. d1 == d2
B. d1.equals(d2)
C. d1 = f
D. f.equals(d1)
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binny 2003-04-30
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b
cuihao 2003-04-30
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不同的对象 是不能比较的
所以c,d错误
至于a是比较地址 不是比较值 所以为false
所以c,d错误
至于a是比较地址 不是比较值 所以为false
piamyou 2003-04-29
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b
no problem
no problem
lishifeng 2003-04-29
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主要的迷惑可能是D。不过其实很简单，看看下面的就知道了。
//以下是关于Double的equals方法的描述。
public boolean equals(Object obj)
Compares this object against the specified object. The result is true if and only if the argument is not null and is a Double object that represents a double that has the same value as the double represented by this object.
//以下是关于Double的equals方法的描述。
public boolean equals(Object obj)
Compares this object against the specified object. The result is true if and only if the argument is not null and is a Double object that represents a double that has the same value as the double represented by this object.
dy18 2003-04-29
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B
mvler 2003-04-28
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b
浮点数在计算机中不是精确表示的
浮点数在计算机中不是精确表示的
awfe 2003-04-28
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B
ghhcld 2003-04-28
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B, SURE!!
ctonyf 2003-04-28
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B
huiyang 2003-04-28
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选b
flyday 2002-12-31
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b is only correct answer!
