auto generate barcode vb net You can assign a new string object to an existing string reference variable. in Java

Generator Code 3/9 in Java You can assign a new string object to an existing string reference variable.

You can assign a new string object to an existing string reference variable.
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String string quote7 string quote7 object = "The to the = "The treasure is in the sand. "; // Assigns to the reference variable treasure is between the rails."; // Assigns new same reference variable
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If you wish to use a mutable character string, consider StringBuffer or StringBuilder as represented in the preceding Scenario & Solution.
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The String Concatenation Operator
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The string concatenation operator concatenates (joins) strings together. The operator is denoted with the + sign.
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n + String concatenation operator
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Programming with Java Operators and Strings
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If you have been programming for at least six months, odds are you have glued two strings together at some time. Java s string concatenation operator makes the act of joining two strings very easy. For example, "doub" + "loon" equates to "doubloon". Let s look at some more complete code.
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String item = "doubloon"; String question = "What is a " + item + " "; System.out.println ("Question: " + question);
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Line 2 replaces the item variable with its contents, "doubloon", and so the question string becomes:
What is a doubloon
Notice that the question mark was appended as well. Line 3 replaces the question variable with its contents and so the following string is returned:
$ Question: What is a doubloon
It is that simple.
The toString Method
The Object class has a method that returns a string representation of objects. This method is appropriately named the toString method. All classes in Java extend the Object class by default, so therefore every class inherits this method. When creating classes, it is common practice to override the toString method to return the data that best represents the state of the object. The toString method makes common use of the string concatenation operator. Let s take a look at a TreasureMap class with the toString method overridden.
public class TreasureMap { private String owner = "Blackbeard"; private String location = "Outer Banks"; public String toString () { return "Map Owner: " + this.owner + ", treasure location: " + this.location; } }
Developing with String Objects and Their Methods
Here, the toString method returns the contents of the class s instance variables. Let s print out the representation of a TreasureMap object.
TreasureMap t = new TreasureMap(); System.out.println(t); $ Map Owner: Blackbeard, treasure location: Outer Banks
Concatenation results may be unexpected if you are including variables that are not initially strings. Consider a string and two integers:
String title1 = " shovels."; String title2 = "Shovels: "; int flatShovels = 5; int roundPointShovels = 6;
The compiler performs left-to-right association for the additive and string concatenation operators. For the following two statements, the first two integers are added together. Next, the concatenation operator takes the toString representation of the result and concatenates it with the other string.
/* Prints '11 shovels' */ System.out.println(flatShovels + roundPointShovels + title1); /* Prints '11 shovels' */ System.out.println((flatShovels + roundPointShovels) + title1);
Moving from left to right, the compiler takes the title2 string and joins it with the string representation of the flatShovels integer variable. The result is a string. Now this result string is joined to the string representation of the roundPointShovels variable. Note that the toString method is used to return the string.
/* Prints 'Shovels: 56' */ System.out.println(title2 + flatShovels + roundPointShovels);
Parentheses take precedence, so you can join the sum of the integer values with the string if you code it as follows:
/* Prints 'Shovels: 11' */ System.out.println(title2 + (flatShovels + roundPointShovels));
3:
Programming with Java Operators and Strings
ExERCISE 3-2 Uncovering Bugs that Your Compiler May Not Find
Consider the strings in the following application:
public class StringTest { public static void main(String[] args) { String s1 = new String ("String one"); String s2 = "String two"; String s3 = "String " + "three"; } }
One of the strings is constructed in an inefficient manner. Do you know which one Let s find out using the FindBugs application from the University of Maryland. 1. Create a directory named code somewhere on your PC (for example, c:\code). 2. Create the StringTest.java source file. 3. Compile the StringTest.java source file; javac StringTest.java. 4. Download the FindBugs software from http://findbugs .sourceforge.net/. 5. Extract, install, and run the FindBugs application. Note that the Eclipse and NetBeans IDEs have plug-ins for the FindBugs tool as well as other software quality tools such as PMD and Checkstyle. 6. Create a new project in FindBugs by choosing File and then New Project 7. Add the project name (for instance, SCJA String Test). 8. Click the Add button for the text area associated with the Class archives and directories to analyze. Find and select the StringTest.class file under the C:\code directory and click Choose. 9. Click the Add button for the text area associated with the Source Directories. Find and select the C:\code directory (not the source file) and then click Choose. 10. The New Project dialog box will look similar to the following Illustration with the exception of your personal directory locations. Click Finish.
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