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对于下列代码,下列哪些表达式返回值为'true'

[单选题]

对于下列代码:

public class Sample{

long length;

public Sample(long l){ length = l; }

public static void main(String arg[]){

Sample s1, s2, s3;

s1 = new Sample(21L);

s2 = new Sample(21L);

s3 = s2;

long m = 21L;

}

}

下列哪些表达式返回值为'true'? ( )

  • s1 = = s2;
  • s2 = = s3;
  • m = = s1;
  • s1.equals(m)
b
发表于 2017-01-19 00:59:32 回复(0)