Exam 7: Characters Strings and the Stringbuilder

StringBuilder greeting = new StringBuilder("Welcome"); Use the append() method to add the characters "home" to the end of the StringBuilder object created above.

String oneStr = "Welcome Jim" String twoStr = "Welcome Joe" Given the lines of code above, which of the following regionMatches() expressions will result in a value of true ?

The ____________________ method requires an integer argument that indicates the position of the character at that position, starting at 0.

Any string value that is input into a program can be used in arithmetic operations.

The ____ method lets you add characters at a specific location within a StringBuilder object.

A(n) ____ is a variable that holds a memory address.

A String variable name is not a simple data type.

Explain what is needed to declare a String variable and provide an example.

When you must determine whether a String is empty, it is more efficient to compare its length to 0 than it is to use the equals () method.

When working with String s, it is necessary to explicitly set a String to null .

String s  and other objects that can't be changed are said to be immutable. What does this mean and how does it relate to values held in memory addresses?

In a compareTo() method, programmers often do not need specific return values but want to determine if a value is positive or negative.

What is the purpose of the replace() method? Provide an example.

Give a code example of using the equivalence operator ("==") to compare the addresses of two strings where the comparison will result in the value true . The example should produce output indicating the strings have the same value.

A ____ is a class for storing and manipulating changeable data that is composed of multiple characters.

You can tell that the equals() method takes a ____ argument because parentheses are used in the method call.

When you declare a variable of a basic, primitive type, such as int x = 10; , the memory address where x is located holds the ____.

A(n) ____ comparison is based on the integer Unicode values of the characters.

If you try to use an index that is less than 0 or less than the index of the last position in the StringBuilder object, you cause an error known as an exception and your program terminates.

When the String class ____ method is used to compare two String s, it provides additional information to the user in the form of an integer value.