public char charAt(int index)

public int compareTo(String anotherString)

public int indexOf(int ch)

public int length()

public String substring(int beginIndex)

public static String valueOf(int i)

public static String valueOf(double d)

Given a String variable bookTitle that has the value of Introduction to Java, use a regular for loop to output each individual character, with one character per line.

Can we use if( s1 = = s2 ) to compare whether the two String object s1 and s2 has the same string content? If not, then how to compare two string variables?

What are the method return values of the following method invocations? Assume String s1 = "Forrest";

s1.length()

s1.indexOf('r')

s1.substring(2)

String.valueOf(14)

String.valueOf(14.5)