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'? ( )
A:s1 = = s2;
B:s2 = = s3;
C:m = = s1;
D:s1.equals(m)
发布时间:2024-03-31 18:18:35