Question

1.

What is output by the following code?
String s0 = "Java";
int i1 = s0.indexOf('a');
int i2 = s0.indexOf('a', i1);
int i3 = s0.indexOf('a', i1 + 1);
System.out.print(i1 + " " + i2 + " " + i3);

2.

What is output by the following code?
String s1 = "Java";
String s2 = "";
for (int i = 0; i < s1.length(); i++) {
s2 += s1;
}
System.out.print(s2);

Answer 1

Question 1

Answer:

The output of the given code is

1 1 3

variable i1 will hold the index of first occurrence of character 'a'. that is 1

variable i2 will also hold the index of first occurrence of character 'a'. that is 1

variable i3 will hold the index after first occurrence of character 'a'. that is 3

Question 2

Answer:

The output of the given code is

JavaJavaJavaJava

String s1 value is "Java'

we are appenind the string s1 to s2 based on the number of characters in string s1.

string s1 contains 4 characters so four "Java" words concatenated to s2.