Introduction to Java Programming by Michael Czapski, Sebastian Krueger, Brendan Marry, Saurabh
By Michael Czapski, Sebastian Krueger, Brendan Marry, Saurabh Sahai, Peter Vaneris, Andrew Walker
Now integrating Java five all through, this reference introduces Java programming basics – together with problem-solving, object-oriented programming, GUI programming, facts constructions, networking, internationalization, complicated GUI programming, and net programming. Includes many new illustrations. complements examples all through, utilizing small, easy, and stimulating examples to illustrate techniques and techniques. bargains anearlier creation to writing courses than the former version. contains a new bankruptcy on recursion, increasing remedy from previous editions. an invaluable reference for somebody drawn to studying extra approximately programming.
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It is known as a reference type. Any Java class can be used as a reference type for a variable. " For the time being, you only need to know how to declare a String variable, how to assign a string to the variable, and how to concatenate strings. 1, two strings can be concatenated. The plus sign (+ ) is the concatenation operator if one of the operands is a string. , a number), the non-string value is converted into a string and concatenated with the other string. Here are some examples: // Three strings are concatenated String message = "Welcome" + "to" + "Java"; // String Chapter is concatenated with number 2 String s = "Chapter" + 2; // s becomes Chapter2 [Page 45] // String Supplement is concatenated with character B String s1 = "Supplement" + 'B'; // s becomes SupplementB If neither of the operands is a string, the plus sign (+ ) is the addition operator that adds two numbers.
The showMessageDialog method is a static method. ) and the method name with arguments. " The showMessageDialog method can be invoked with four arguments, as in lines 9–10. The first argument can always be null . " The second argument can be a string for text to be displayed. The third argument is the title of the message box. INFORMATION_MESSAGE displayed in the message box. Page 514 , which causes the icon ( ) to be Note There are several ways to use the showMessageDialog method. For the time being, all you need to know are two ways to invoke it.
The formula for computing the monthly payment is translated into Java code in lines 32–33. The statements in lines 37–38 are for formatting the number to keep two digits after the decimal point. For example, if monthlyPayment * 100) is 207602 . 02 . The strings are concatenated into output in lines 11–25. The linefeed escape character '\n' is in the string to display the text after '\n' in the next line. Note If you click Cancel in the input dialog box, no string is returned. A runtime error would occur.