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Developing with String Objects and Their Methods
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You wish to use an AND operator that evaluates the second operand whether the first operand evaluates to true or false. Which would you use You wish to use an OR operator that evaluates the second operand whether the first operand evaluates to true or false. Which would you use You wish to use an AND operator that evaluates the second operand only when the first operand evaluates to true. Which would you use You wish to use an OR operator that evaluates the second operand only when the first operand evaluates to false. Which would you use Boolean AND (&) Boolean OR (|) Logical AND (&&) Logical OR (||)
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Developing with String Objects and Their Methods
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Exam Objective 4.6 Develop code that uses the concatenation operator (+), and the following methods from class String: charAt, indexOf, trim, substring, replace, length, startsWith, and endsWith. Strings are commonly used in the Java programming language. This section discusses what strings are, how to concatenate separate strings, and then details the methods of the String class. When you have completed this section, which covers the following topics, you should fully understand what strings are and how to use them.
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n Strings n String concatenation operator n Methods of the String class
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String objects are used to represent 16-bit Unicode character strings. Consider the 16 bits 000001011001 followed by 000001101111. These bits in Unicode are represented as \u0059 and \u006F. \u0059 is mapped to the character Y , and
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Programming with Java Operators and Strings
\u006F is mapped to the character o . An easy way of adding 16-bit Unicode
character strings together in a reusable element is by declarating the data within a string.
String exclamation = "Yo"; // 000001011001 and 000001101111
See Appendix C for more information on the Unicode standard. Strings are immutable objects, meaning their values never change. For example, the following text, Dead Men Tell No Tales , can be created as a string.
String quote = "Dead Men Tell No Tales";
In the following example, the value of the string does not change after a String method returns a modified value. Remember that strings are immutable. Here, we invoke the replace method on the string. Again, the new string is returned, but will not change the value.
quote.replace("No Tales", "Tales"); // Returns new value System.out.println(quote); // Prints the original value $ Dead Men Tell No Tales
We can create strings in several ways. As with instantiating any object, you need to construct an object and assign it to a reference variable. As a reminder, a reference variable holds the value s address. Let s look at some of the things you can do with strings. You can create a string without an assigned string object. Make sure you eventually give it a value, or you ll get a compiler error.
String quote1; // quote1 is a reference variable with no assigned string object quote1 = "Ahoy matey"; // Assigns string object to the reference variable
You can use a couple of basic approaches to create a string object with an empty string representation.
String quote2a = new String(); // quote2a is a reference variable String quote2b = new String(""); // Equivalent statement
You can create a string object without using a constructor.
String quote3 = "The existence of the sea means the existence of Pirates! -- Malayan proverb";
Developing with String Objects and Their Methods
SCENARiO & SOlUTiON
You wish to use an object that represents an immutable character string. Which class will you use to create the object You wish to use an object that represents a thread-safe mutable character string. Which class will you use to create the object You wish to use an object that represents a mutable character string. Which class will you use to create the object The String class The StringBuffer class The StringBuilder class
You can create a string object while using a constructor.
/* quote4 is a reference variable to the new string object */ String quote4 = new String("Yo ho ho!");
You can create a reference variable that refers to a separate reference variable of a string object.
String quote5 = "You're welcome to my gold -- William Kidd."; String quote6 = quote5; // quote6 refers to the quote5 reference variable of a string
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