fibonaccitest.java

一些JAVA基础性源代码

package exec.day0911;
/**
 * 输入一个数据n，计算斐波那契数列(Fibonacci)的第n个值，并打印整个数列
 * @author Administrator
 *
 */
public class FibonacciTest{
	public static void main(String args[]){
		int n = Integer.parseInt(args[0]);
		if(n<=0){
			System.out.println("参数错误!");
			return;
		}
		FibonacciTest t = new FibonacciTest();

		for(int i=1;i<=n;i++){
			int num = t.getFib(i);
			System.out.print(num+" ");
		}
	}
	public int getFib(int n){
		//sum为两个加数的和
		int sum = 0;
		//n1和n2分别作为两个加数
		int n1 = 1;
		int n2 = 1;
		if(n<=2){
			sum = 1;
		}else{
			for(int i=3;i<=n;i++){
				sum = n1 + n2;
				n1 = n2;
				n2 = sum;
			}
		}
		return sum;
	}
}