By John Cowell BSc (Hons), MPhil, PhD (auth.)
Java is an item orientated language which lets you create interactive web content, or to put in writing functions so that it will run on any desktop. visible J++ can provide entry to the ability of Java with all of the advantages of a latest visible improvement setting, for quick programming, and debugging. while you are new to Java or are an current Java programmer who desires to change to visible J++, this booklet can provide all of the crucial info you would like utilizing plenty of examples. issues lined during this booklet comprise: the Java language, polymorphism, inheritance and encapsulation, portraits and animation, dealing with occasions, utilizing records, exception dealing with, summary windowing toolkit, the Java applet wizard and the source wizards, debugging, and venture administration. EssentialVisual J++ 6.0 fast is designed for pro builders or scholars who have to examine the utmost within the minimal time and to enhance purposes fast.
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Additional info for Essential Visual J++ 6.0 fast : How to develop Java applications and applets with Visual J++
Sample text
The statement: my1nt = myFloat * myDouble; cannot be compiled and produces a compiler error, since Java cannot implicitly convert from the float and double types to the weaker int type. 2 is implicitly double. If you want to convert a stronger type to a weaker type you need to do so explicitly. 2; myInt = (int)myFloat * (int)myDouble; System. println(myInt); a value of 20 is produced. Additional integer operators In addition to the usual assignment operator (=) Java has a range of shortcuts available.
The third column in the table shows the output from these pairs of inputs. The & operator is applied to all pairs of corresponding bits in the variables concerned. For example 19 & 135. 19 in binary is 0000 0000 0001 0011. 135 in binary is 0000 0000 1000 0111. 0000 0000 0001 0011 0000 0000 1000 0111 0000 0000 0000 0011 & 2+1 = 3 The result of applying the & operator is 0000 0000 0000 0011 in binary which is 3 in decimal. 4 The 1 operator. 5 The 1\ operator. A o o 1 1 B o o o r o 1 1 1 191\ 135 is given by: 0000 0000 0001 0011 0000 0000 1000 0111 0000 0000 1001 0100 1\ 128+16+4=148 The shift operators move the whole pattern of bits either to the left or the right.
The single line: int[ ] values new int[5]; = is equivalent to : int values[ ]; values = new int[5]; The array elements are initialized, 0 for numbers, false for booleans, null for strings and \0 for characters, however you can specify the initial values of the array elements: int[ ] values (3, 45, 87, 23, 9); = This defmes a five element array of integers and assigns value[O] the number 3, value[1} the number 45 and so on. When strings are initialized each string item is enclosed in quotes: String[ } languages = {"Java", "C++", "Object Pascal''}; If you want to change an array element you do so by specifying its name and the element that you want to change: languages[2] = "Visual Basic"; A common problem in C++ is that if you defme an array as having, for example, 10 elements and you try and write to an element greater than this at run time, unexpected problems can happen.