Author Question: Analyze the following code.class Test { public static void main(String[] args) { StringBuilder ... (Read 62 times)

karlynnae · **on:** May 6, 2020

Question 1

What is displayed by the following code?

String[] tokens = "A,B;C;D".split("[,;]");
for (int i = 0; i < tokens.length; i++)

System.out.print(tokens[i] + " ");

◦ A,B;C;D
◦ A B C D
◦ A B;C;D
◦ A B C;D

Question 2

Analyze the following code.

class Test {
public static void main(String[] args) {

StringBuilder strBuf = new StringBuilder(4);

strBuf.append("ABCDE");

System.out.println("What's strBuf.charAt(5)? " + strBuf.charAt(5));

}
}

◦ The program has a compilation error because you cannot specify initial capacity in the StringBuilder constructor.
◦ The program has a runtime error because because the buffer's capacity is 4, but five characters "ABCDE" are appended into the buffer.
◦ The program compiles and runs fine.
◦ The program has a runtime error because the length of the string in the buffer is 5 after "ABCDE" is appended into the buffer. Therefore, strBuf.charAt(5) is out of range.

diesoon · **Reply #1 on:** May 6, 2020

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