作业答案 JAVA教程教案.pptVIP

作业2 1 用递归求斐波纳契数列的前10项 F0=0 F1=1 Fn=Fn-1+Fn-2 public class FibonacciTest{ static int value = 1; static int fibonacci (int n){ int temp; if (n == 0||n ==1) return n; else{ temp = fibonacci (n-1) + fibonacci (n-2); if(tempvalue) { System.out.print(“ ” +value) ; value = temp; } return temp; } } public static void main (String args[]){ int n=10; System.out.print(“0 1”); fibonacci(n); System.out.print(“\n”); } } public class FibonacciTest{ static int fibonacci (int n){ if (n == 0||n ==1) return n; else return fibonacci (n-1) + fibonacci (n-2); } public static void main (String args[]){ int n=10; for (int i=0;in;i++) System.out.print(fibonacci(n)); } } 2.访问权限，类变量(方法) ，实例变量(方法) 访问权限：public,protected,default, private 类变量还是实例变量：static 类方法还是实例方法：static // SaveAccountTest.java class SaveAccount{ static double rate; private double saving; public SaveAccount( double s) { setSaving( s ); } public void setSaving( double s ) {saving = s; } public double getSaving () { return saving; } public static void modifyRate( double r ) {SaveAccount.rate = r; } public double calculate( ) {return saving*rate/12;} } public class SaveAccountTest { public static void main( String args[] ) { SaveAccount saver1=new SaveAccount(2000.00); SaveAccount saver2=new SaveAccount(3000.00); SaveAccount.modifyRate( 0.04 ) ; System.out.println(“ saver1新存款余额: ” + (saver1.getSaving () + saver1.calculate() ) ); System.out.println(“ saver2新存款余额: ” + (saver2.getSaving () +saver2.calculate() ) ); } }