方法一：public class Fibonacci1{
//定义三个变量方法
public static void main(String[] args) {
int a=1, b=1, c=0;
System.out.println("斐波那契数列前20项为：");
System.out.print(a + "\t" + b + "\t");
for (int i = 1; i <= 18; i++) {
c = a + b;
a = b;
b = c;
System.out.print(c + "\t");
if ((i + 2) % 5 == 0)
System.out.println(); }}}
方法二：public class Fibonacci2{
//定义数组方法
public static void main(String[] args) {
int arr[] = new int[20];
arr[0] = arr[1] = 1;
for (int i = 2; i < arr.length; i++) {
arr[i] = arr[i - 1] + arr[i - 2]; }
System.out.println("斐波那契数列的前20项如下所示：");
for (int i = 0; i < arr.length; i++) {
if (i % 5 == 0)
System.out.println();
System.out.print(arr[i]+"\t"); }}}
方法三：public class Fibonacci3 {
//使用递归方法
private static int getFibo(int i) {
if (i == 1 || i == 2)
return 1;
else
return getFibo(i - 1) + getFibo(i - 2);}
public static void main(String[] args) {
System.out.println("斐波那契数列的前20项为：");
for (int j = 1; j <= 20; j++) {
System.out.print(getFibo(j) + "\t");
if (j % 5 == 0)
System.out.println();}}} |
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