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For example, if the programmer needs an object corresponding to the integer 22148, the programmer can use this code: Integer ix; ix = new Integer( 22148 ); The first line declares that ix is a variable of type Integer. Since Integer is a class, not a primitive type, ix is an object. The JVM will reserve space for an Integer object, not just 32 bits for an int. The second line says to create a new Integer object whose value is 22148, and assign that object to the variable ix. Another built-in Java class that you will use very, very often is the class String. A String object consists of none, one, several or many characters which are treated as one object. For instance: String myName; myName = "Carl"; The first line declares that the variable myName is of type String. If the programmer prints the variable myName, all the characters in the word Carl will be printed: System.out.println( "name: " + myName ); The plus sign in the println statement says to concatenate (combine together) the characters "name: " and "Carl". The result will be: name: Carl
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ARRAYS A data structure is a way of organizing data, and arrays are among the simplest of data structures. An array is a data structure that holds multiple values of the same type. One speaks of an array of Strings, or an array of ints. One declares an array by using square brackets, either after the type declaration or after the name: int[] x; // either form declares an array of ints int y[]; Declaring an array simply gives it a name. To create the elements of an array, one must also use the new key word, along with an integer within square brackets to indicate the number of elements in the array: x = new int[15]; // 15 int elements, each set to 0 y = new int[10]; // 10 int elements, each set to 0 Once the array is created, its size cannot be changed. Individual elements in an array receive default values of zero for numeric types, nulls for characters, and nulls for Strings and other objects. By using a subscript, one can assign values to elements of an array, or read the value of an element. In Java, arrays are zero-based, which means that the first element of the array is referred to with a subscript of 0. x[4] = 66; // assign the value 66 to the 5th element c = y[1];// read the value of the 2nd element into c Each Java program s main method declares an array of Strings, by convention called args, for accepting any arguments that the user might supply from the command line. If the user types: java myProg firstParam secondParam
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the program myProg can retrieve the String firstParam from args[0], and the String secondParam from args[1]. JAVA OPERATORS Operators are symbols in a language that stand for built-in functions. Java has a great many operators and, since this chapter will only serve to introduce the Java language, we will not discuss them all. Here are the operators we will discuss: Operator = + * / ++ -&& || == != > < >= <= Function assignment add subtract multiply divide increment by 1 decrement by 1 logical AND logical OR equal (notice that there are 2 equal signs) not equal greater than less than greater than or equal less than or equal
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By assignment, we mean taking the value on the right side of the equal sign (sometimes called RS) and giving that value to the variable on the left side of the equal sign (sometimes called LS). If the value of k is 5, after the following statement is executed, the value of c will also be 5. Likewise, the value of k will remain 5 after execution: c = k; The arithmetic operators perform their expected functions. For example, if the value of a is 3, and the value of b is 5, after the following statement executes the value of x will be 15: x = a * b; In contrast to some other languages, Java has no operator for exponentiation. If a programmer wants to raise a number to some power, the program must perform the exponentiation either by repeatedly multiplying, or by using the pow() method of the Math class which is part of the built-in Java library. The ++ and -- operators are convenience operators that many programmers like because they save some typing. The following two statements have the same effect: m = m + 1; m++; In either case, the value of m will increase by 1. The -- operator works similarly, except that the value of the variable will decrease by 1. The rest of the operators in our list are logical operators. We use logical operators to test the truth of conditions important to our programs. For example, if our program were going to find all the houses in a neighborhood whose assessed values were greater than $200,000, our program might have a statement like this in it: if ( assessedValue > 200000 ) {
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