8196552
Descripción
Fichas por Mayra Ansaldi, actualizado hace más de 1 año
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Creado por Mayra Ansaldi
hace más de 7 años
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| Pregunta | Respuesta |
| InputDialog | Prompts the user for text input |
| ConfirmDialog | Asks the user a question, providing buttons that the user can click yes or no and cancel responses. |
| HelloNameDialog Class Code Sample | |
| ShowInputDialog() | Has 4 components 1. screen component frame of which the dialog box will appear. If null dialog box centered. 2. title to be displayed in the title bar of the input dialog box 3. A class field describing the dialog box: ERROR_MESSAGE, INFORMATION_MESSAGE, PLAIN_MESSAGE, QUESTION_MESSAGE, or WARNING_MESSAGE |
| type-wrapper classes | To convert a String to an integer or double, you must use methods from the built-in Java classes Integer and Double. Each primitive type in Java has a corresponding class contained in the java.lang package; like most classes, the names of these classes begin with uppercase letters. These classes are called type-wrapper classes. They include methods that can process primitive type values. |
| String & String Ojects | The Java String class is most commonly used for any manipulation, calculations and storing user data. Once created can't be modified. The Strings class in Java has string objects, which are a combination of characters including numbers and punctuations. |
| Parse | means to break into component parts. Parsing a String converts it to its numeric equivalent. |
| Confirm Dialog Box | Displays the options Yes, No or cancel. Simple options presented to the user |
| Sample of Confirm Dialog Box Code | |
| 1) Standard Arithmetic Operators 2) Operand 3) Binary Operations | 1) Used to perform calculations 2) Value on either side of an operator 3) Require two operands |
| Floating Point Division | e.g. 45.0 / 2 is 22.5 with decimals |
| Integer Division | occurs when both the operands are integers. e.g. 45 / 2 is 22 39 /5 is 7 |
| Remainder Operator or Modulus Operator or Mod | Is the % sign You use the remainder as the result e.g. 39 % 5 the answer is 2 e.g. 20 % 3 is 2 (6*3=18 remainder of 2) |
| Operator Precedence | The rules for the order in which parts of a mathematical expression are evaluated *, /, & % Higher + and - Lower |
| Associativity | When you combine mathematical operations with the same precedence their associativity is left to right. |
| Type Conversions | The process of converting one data type to another. e.g. Int to Bytes. When performing arithmetic operations of the same type (int to int or byte to byte) the result will be on that same type. But sometimes you will need to use different types bytes and ints and convert it to a different type. |
| Unifying Type | The type to which all operands in an expression are converted so that they are compatible with each other through implicit conversion (promotions). So - simply put it takes the highest in the order of operations and converts it to that. |
| Data Types | |
| Data Types 2 | |
| Implicit Conversion | Automatically converts non confirming operandants |
| Type Casting IS Explicit Conversion | Forces a value of one data type to be used as a value of another type by using a cast operator which is created by placing the desired result type into a parentheses |
| Sample Type Casting- Cast Operator also called Unary Cast Operator | |
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