Page 204 - Introduction to Programming with Java: A Problem Solving Approach

170 Chapter 5 Using Pre-Built Methods
to the afterEndIndex-1 position, where beginIndex and afterEndIndex are the substring method’s two parameters.
2
The following code fragment processes a quote from Candide. In its candide.substring(8)
method call, candide is the calling object, and 8 is the beginIndex parameter value. As you might recall, string indices start at 0. So the 8 refers to candide’s ninth character, which is ‘c’. Thus, the first println
statement prints cultivate
method call. The 3 and 17 refer to candide’s fourth and eighteenth characters, which are ‘m’ and a space. Thus, the second println statement prints must cultivate.
String candide = "we must cultivate our garden";
System.out.println(candide.substring(8));
System.out.println(candide.substring(3,17));
Output:
cultivate our garden
must cultivate
If you want to test the above code fragment or any of the following String method code fragments, use Figure 5.9’s program as a template. More specifically, replace Figure 5.9’s main method body with the new code fragment. Then compile and run the resulting program.
Position Determination Apago PDF Enhancer
Note the one-parameter indexOf methods in Figure 5.8. They return the position of the first occurrence of a given character or substring within the calling-object string. If the given character or substring does not appear within the calling-object string, indexOf returns 􏰂1.
Note the two-parameter indexOf methods in Figure 5.8. They return the position of the first occurrence of a given character or substring within the calling-object string, starting the search at the position specified by indexOf’s second parameter. If the given character or substring is not found, indexOf returns 􏰂1.
It’s common to use one of the indexOf methods to locate a character or substring of interest and then use one of the substring methods to extract it. For example, consider this code fragment:3
Here’s the beginning of the hamlet2 substring. String hamlet = "To be, or not to be: that is the question;";
int index = hamlet.indexOf(':');
String hamlet2 = hamlet.substring(index + 1);
System.out.println(hamlet2);
Output:
that is the question;
Notice that the first character printed is a space.
2 Voltaire, Candide, translated by Lowell Bair, Bantam Books, 1959, final sentence. 3 Shakespeare, Hamlet, Act III, Sc. 1.
our garden. Note the code fragment’s candide.substring(3,17)