create barcode with vb.net Returning an Array from a Method in Java

Encoding QR in Java Returning an Array from a Method

Returning an Array from a Method
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Sometimes a method needs to return an array to the statement that calls the method This is accomplished by placing the array name in the return statement of the method, as is shown in the following example:
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class Demo { public static void main (String args[]) { float rawTest[]; rawTest = testData(); Systemoutprintln("Correction Answers: " + rawTest[0]); Systemoutprintln("Total Questions: " + rawTest[1]); } static float[] testData() { float rawTest[] = {70,100}; return rawTest; } }
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Let s see how this program works It begins in the main() method with a declaration of a reference to an array of floats Remember that a declaration of a reference is not the same as declaring an array A reference is simply a pointer to an array, and an array is actually a block of memory The reference is used to receive the return value from the testData() method The testData() method returns the number of correct answers and the number of questions appearing on the test You ll notice from looking at the definition of the
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CHAPTER 5 Arrays
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testData() method that there are no arguments because the testData() method doesn t require any additional information to complete its processing The testData() method declares an array of floats that consists of two array elements This is the same array used in the previous example The first array element contains the number of correct answers, and the second array element contains the number of questions appearing on the test Notice that the name of the array is used as the return value As you ll recall from the previous section, the array name points to the first address of the memory that contains the array It is this address that is assigned to the array reference in the statement that calls the testData() method An array is returned by a method That is, both the method and the statement that called the method have access to the array Either one can change the elements of the array
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Alternate Ways of Creating an Array
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In Java, you have several other ways to declare an array other than those discussed so far in this chapter One of those ways is to place the square brackets on the left side of the array name In the examples so far, we ve placed the square brackets on the right side of the array Either way is acceptable, as shown here There is no advantage or disadvantage to using one way over the other
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float float float float rawTest [] rawTest [] [] [] rawTest [] [] rawTest
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Another alternative is to declare an array reference in two different statements Previously in this chapter, we declared the array reference in the same statement that declared the array Here are examples of both ways:
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float rawTest = new float [4];
float rawTest; rawTest = new float [4];
Also, you can declare a multidimensional array by specifying only one dimension rather than all dimensions This is referred to as an irregular array because all the dimensions of the array are not created in the same statement There is no advantage or disadvantage to declaring an irregular array
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Here s how this works: The first statement in the following example declares a two-dimensional array where only the dimension is defined in the statement that declares the array Subsequent statements declare the second dimension
float rawTest[][] rawTest [0] = new rawTest [1] = new rawTest [2] = new = new float float float float[3][]; [2]; [2]; [2];
The Arrays Class
Previously in this book you learned that a class is like a cookie cutter A cookie cutter defines all the parts of a cookie, and a class defines all the parts of an object of that class Think of the object of the class as the cookie made by a cookie cutter As you ll recall, parts of a class are called members of a class, and they fall within two categories: data members and method members A data member is like the length data member for an array, which you were introduced to earlier in this chapter A method member is a method that is associated with the class You ll learn a lot more about classes in 7, but for now that s all you need to know in order to understand how to use the Arrays class in your program The Arrays class is a class already defined for you in the javautil package that came with your Java compiler Its purpose is to make it easy for you to work with arrays Typically, you ll want to search, sort, and otherwise manipulate elements of an array You can use loops and a variety of statements and expressions to do these things However, you can save a lot of time and reduce the amount of statements you have to write by using methods defined in the Arrays class The Arrays class defines a number of methods We ll take a close look at how to use the more common methods: equals(), fill(), sort(), and binarySearch()
equals()
The equals() method is used to compare elements of two arrays Each array is passed as an argument to the equals() method, which then computes whether the arrays are equal to each other If so, the equals() method returns a Boolean true; otherwise, a Boolean false is returned The following example shows how to use the equals() method in your program:
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