String Methods

Returns the character found at a specified position in a string. Positions start at 0 and continue to the number of characters in the string minus 1. For example, the letter ‘h’ is at position 5.

• String x = "Joseph";System.out.println(x.charAt(2));
• String x = "Joe"; System.out.println(x.equals("Joe"));
• String x = "Joseph"; System.out.println(x.substring(2));
• String x = "Joseph"; System.out.println(x.substring(2,5));

Returns a true or false value dependent on whether two strings are equal in value (if they match). Use the [equalsIgnoreCase()] method if the caps sensitivity of the value being matched is not important.

• String x = "Joseph";System.out.println(x.charAt(2));
• String x = "Joe"; System.out.println(x.equals("Joe"));
• String x = "Joseph"; System.out.println(x.substring(2));
• String x = "Joseph"; System.out.println(x.substring(2,5));

Returns a substring (a section of a string) starting at a specified position. Like other methods, the positions start at 0 and continue to the number of characters in the string minus 1.

• String x = "Joseph";System.out.println(x.charAt(2));
• String x = "Joe"; System.out.println(x.equals("Joe"));
• String x = "Joseph"; System.out.println(x.substring(2));
• String x = "Joseph"; System.out.println(x.substring(2,5));

Returns a substring (a section of string) between a start position and end position. The positions start at 0 and continue to the number of characters in the string minus 1.

• String x = "Joseph";System.out.println(x.charAt(2));
• String x = "Joe"; System.out.println(x.equals("Joe"));
• String x = "Joseph"; System.out.println(x.substring(2));
• String x = "Joseph"; System.out.println(x.substring(2,5));

Finds a specified character or characters in a string and replaces it with a specified character or characters.

• String x = "joseph"; System.out.println(x.replace("j", "J"));
• String x = "Joseph"; System.out.println(x.endsWith("h"));
• String x = "joseph"; System.out.println(x.toUpperCase());
• String x = " joseph "; System.out.println(x.trim());

Returns a true or false value dependent on whether the string ends/starts with a specified character or characters.

• String x = "joseph"; System.out.println(x.replace("j", "J"));
• String x = "Joseph"; System.out.println(x.endsWith("h"));
• String x = "joseph"; System.out.println(x.toUpperCase());
• String x = " joseph "; System.out.println(x.trim());

Turns all characters in a string to either UPPER-CASE or lower-case. This can be useful when matching strings given from a user.

• String x = "joseph"; System.out.println(x.replace("j", "J"));
• String x = "Joseph"; System.out.println(x.endsWith("h"));
• String x = "joseph"; System.out.println(x.toUpperCase());
• String x = " joseph "; System.out.println(x.trim());

Removes all character spaces at the beginning and end of a string. Note that this will not remove any character spaces that appear in the middle of a string.

• String x = "joseph"; System.out.println(x.replace("j", "J"));
• String x = "Joseph"; System.out.println(x.endsWith("h"));
• String x = "joseph"; System.out.println(x.toUpperCase());
• String x = " joseph "; System.out.println(x.trim());

Returns a true or false value dependent on whether a string contains the values from another string. The matching string must be exact; for example, ‘SE’ or ‘s e’ would have returned false.

• String x = "Joseph"; System.out.println(x.contains("se"));
• String x = "Joseph"; System.out.println(x.endsWith("h"));
• String x = "joseph"; System.out.println(x.toUpperCase());
• String x = " joseph "; System.out.println(x.trim());