AP CSA Student Practice

Strings

For the AP Exam, you will need to use the following methods:

• int length()
• String substring(int from, int to)
• String substring(int from)
• int indexOf(String str)
• boolean equals(Object other)
• int compareTo(String other)
• String[] split(String del)

Use the following examples to learn and practice creating String objects and using each of these methods. NOTE: Instead of System.out we are using IO. IO is not on the AP Exam and it works identically to System.out. On the AP exam, you will continue to see System.out.

Creation: Creation and assign simple strings of characters

• Example 1
• Example 2
• Example 3
• Example 4

length(): Getting the Length of a String

• Example 1
• Example 2
• Example 3
• Example 4

substring(): Getting a Substring from a String and an Index

• Example 1
• Example 2
• Example 3

indexOf: Finding the Index of a String in Another String

• Example 1
• Example 2

equals: Comparing Strings with == and equals()

• Example 1
• Example 2

compareTo: Using compareTo() to Get the Rank of a Name in Alphabetical Order

• Example 1
• Example 2
• Example 3
• Example 4
• Example 5

split: Splitting a String of Characters with split()

• Example 1
• Example 2