Object-OrientedProgramminginJava.ppt

Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * Request to get information about the state of the object Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * Request to change the state of an object. Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * then: write class person live Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * Objects First with Java ? David J. Barnes and Michael K?lling * circleArray references to the entire array. circleArray[1] references to a Circle object. * If you delete the set method in the Circle class in the preceding example, the class would be immutable because radius is private and cannot be changed without a set method. * mmutable classes are useful because theyre thread-safe. Strong immutability - by making class final Immutable objects contains its initialized values until it dies * Trace Program with Arrays public class Test { public static void main(String[] args) { int[] values = new int[5]; for (int i = 1; i 5; i++) { values[i] = i + values[i-1]; } values[0] = values[1] + values[4]; } } Declare array variable values, create an array, and assign its reference to values animation CS2336: Object-Oriented Programming in Java Trace Program with Arrays public class Test { public static void main(String[] args) { int[] values = new int[5]; for (int i = 1; i 5; i++) { values[i] = i + values[i-1]; } values[0] = values[1] + values[4]; } } i becomes 1 animation CS2336: Object-Oriented Pro