Java第五章Java面向对象程序的设计.ppt

习题 创建类SaveAccount。用一个static类变量为每个储户Rate（年利率）。类的每个对象包含一个private实例变量saving，表示储户现在的存款余额。提供方法calculate计算月息：用saving乘以Rate再除以12；月息也应加到saving中。提供一个static方法modifyRate，设置Rate的新值。编写程序测试SaveAccount。实例化两个不同的SaveAccount对象，saver1和saver2，分别有存款2000.00和3000.00元。将Rate设置为4%，然后计算月息，并且打印每个储户的新存款余额。 习题 重新设计和实现oval和rectangle. class A{ int x,y; A(int x,int y){this.x=x; this.y=y; } void setX(int x){ this.x=x;} void setY(int y){ this.y=y;} void out() {System.out.println( x=+x+;y=+y);} } class B extends A{ int z; B(int x,int y,int z){super(x,y); this.z=z; } void out(){System.out.println( x=+x+;y=+y+;z=+z);} } public class ABTest{ public static void main(String args[]){ A a1=new A(3,4); a1.setX(6); a1.out(); B b1=new B(1,2,3); b1.setX(0); b1.setY(5); b1.out(); } } ? 数据结构（例） 链表 堆栈 队列 树 链表（例） // EmptyListException.java // Class EmptyListException definition package com.deitel.jhtp3.ch22; public class EmptyListException extends RuntimeException { public EmptyListException( String name ) {super( The + name + is empty ); } } // List.java： Class ListNode and class List definitions package com.deitel.jhtp3.ch22; class ListNode { Object data; ListNode next; // Constructor: Create a ListNode that refers to Object o. ListNode( Object o ) { this( o, null ); } // Constructor: Create a ListNode that refers to Object o // and to the next ListNode in the List. ListNode( Object o, ListNode nextNode ) { data = o; // this node refers to Object o next = nextNode; // set next to refer to next } // Return a reference to the Object in this node Object getObject() { return data; } // Return the next node ListNode getNext() { return next; }} public class List { private ListNode firstNode; private ListNode lastNode; private String name; // String like list used in printing public List( String s ){ name = s; fir