Q: Predict the output:-

String str1 = "great";
String str2 = "minds";

System.out.println(str1.substring(0, 2).concat(str2.substring(1)));
System.out.println("WH" + (str1.substring(2).toUpperCase()));

Let's analyze the given Java code step by step to predict its output:

Code:

String str1 = "great";
String str2 = "minds";

System.out.println(str1.substring(0, 2).concat(str2.substring(1)));
System.out.println("WH" + (str1.substring(2).toUpperCase()));
        

Explanation:

1. First Line:

   System.out.println(str1.substring(0, 2).concat(str2.substring(1)));\
   - str1.substring(0, 2) extracts a substring from str1 starting at index 0 up to, but not including, index 2.
   For str1 = "great", str1.substring(0, 2) results in "gr".
   - str2.substring(1) extracts a substring from str2 starting at index 1 to the end of the string.
   For str2 = "minds", str2.substring(1) results in "inds".
   - Concatenating these results:
   "gr".concat("inds") results in "grinds".
   - Therefore, the first println statement prints "grinds".

2. Second Line:

   System.out.println("WH" + (str1.substring(2).toUpperCase()));
   - str1.substring(2) extracts a substring from str1 starting at index 2 to the end of the string.
   For str1 = "great", str1.substring(2) results in "eat".
   - str1.substring(2).toUpperCase() converts this substring to uppercase.
   "eat".toUpperCase() results in "EAT".
   - Concatenating "WH" with the result:
   "WH" + "EAT" results in "WHEAT".
   - Therefore, the second println statement prints "WHEAT".

Conclusion:

The output of the code is:

• grinds
• WHEAT