== is used to check whether the references are of the same object..equals () is used to check whether the contents of the objects are the same.But with respect to strings, object refernce with same contentwill refer to the same object.String str1=”Hello”;String str2=”Hello”;(str1==str2) and str1.equals(str2) both will be true.If you take the same example with Stringbuffer, the results would be different.Stringbuffer str1=”Hello”;Stringbuffer str2=”Hello”;str1.equals(str2) will be true.str1==str2 will be false.
Java
Topic: Object
What is the importance of == and equals () method with respect to String object?
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What is the value of "d" after this line of code has been executed?double d = Math.round ( 2.5 + Math.random( )); What is the value of "d" after this line of code has been executed?double d = Math.round ( 2.5 + Math.random( ));A. 2B. 3C. 4D. 2.5
Which of the following would compile without error?A. int a = Math.abs(-5);B. int b = Math.abs(5.0);C. int c = Math.abs(5.5F);D. int d = Math.abs(5L);
Which of the following are valid calls to Math.max? Math.max(1,4) Math.max(2.3, 5) Math.max(1, 3, 5, 7) Math.max(-1.5, -2.8f)A. 1, 2 and 4B. 2, 3 and 4C. 1, 2 and 3D. 2, 3 and 4
public class Myfile { public static void main (String[] args) { String biz = args[1]; String baz = args[2]; String rip = args[3]; System.out.println("Arg is " + rip); } }Select how you would start the program to cause it to print: Arg is 2A. java Myfile 222B. java Myfile 1 2 2 3 4C. java Myfile 1 3 2 2D. java Myfile 0 1 2 3
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What will be the output of the program?public class Example { public static void main(String [] args) { double values[] = {-2.3, -1.0, 0.25, 4}; int cnt = 0; for (int x=0; x < values.length; x++) { if (Math.round(values[x] + .5) == Math.ceil(values[x])) { ++cnt; } } System.out.println("same results " + cnt + " time(s)"); }}A. same results 0 time(s)B. same results 2 time(s)C. same results 4 time(s)D. Compilation fails.
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