# Java 程序：使用循环显示 Fibonacci 序列 > 原文： [https://beginnersbook.com/2017/09/java-program-to-display-fibonacci-series-using-loops/](https://beginnersbook.com/2017/09/java-program-to-display-fibonacci-series-using-loops/) Fibonacci 序列是一序列数字，其中数字是前两个数字的总和。从 0 和 1 开始，序列变为`0,1,1,2,3,5,8,13,21`等。在这里，我们将编写三个程序来打印斐波纳契序列 1）使用`for`循环 2）使用`while`循环 3）基于用户输入的数字 要理解这些程序，你应该拥有[`for`循环](https://beginnersbook.com/2015/03/for-loop-in-java-with-example/) 和[`while`循环](https://beginnersbook.com/2015/03/while-loop-in-java-with-examples/)的知识。 > 如果您是 java 新手，请参考 [java 编程教程](https://beginnersbook.com/java-tutorial-for-beginners-with-examples/)开始学习基础知识。 ## 示例 1：使用`for`循环打印斐波纳契序列 ```java public class JavaExample { public static void main(String[] args) { int count = 7, num1 = 0, num2 = 1; System.out.print("Fibonacci Series of "+count+" numbers:"); for (int i = 1; i <= count; ++i) { System.out.print(num1+" "); /* On each iteration, we are assigning second number * to the first number and assigning the sum of last two * numbers to the second number */ int sumOfPrevTwo = num1 + num2; num1 = num2; num2 = sumOfPrevTwo; } } } ``` 输出： ```java Fibonacci Series of 7 numbers:0 1 1 2 3 5 8 ``` ## 示例 2：使用`while`循环显示 Fibonacci 序列 ```java public class JavaExample { public static void main(String[] args) { int count = 7, num1 = 0, num2 = 1; System.out.print("Fibonacci Series of "+count+" numbers:"); int i=1; while(i<=count) { System.out.print(num1+" "); int sumOfPrevTwo = num1 + num2; num1 = num2; num2 = sumOfPrevTwo; i++; } } } ``` 输出： ```java Fibonacci Series of 7 numbers:0 1 1 2 3 5 8 ``` ## 示例 3：基于用户输入显示斐波那契序列 该程序根据用户输入的数字显示顺序。例如 - 如果用户输入 10，则此程序显示 10 个数字的序列。 ```java import java.util.Scanner; public class JavaExample { public static void main(String[] args) { int count, num1 = 0, num2 = 1; System.out.println("How may numbers you want in the sequence:"); Scanner scanner = new Scanner(System.in); count = scanner.nextInt(); scanner.close(); System.out.print("Fibonacci Series of "+count+" numbers:"); int i=1; while(i<=count) { System.out.print(num1+" "); int sumOfPrevTwo = num1 + num2; num1 = num2; num2 = sumOfPrevTwo; i++; } } } ``` 输出： ```java How may numbers you want in the sequence: 6 Fibonacci Series of 6 numbers:0 1 1 2 3 5 ``` 查看这些相关的 Java 程序： 1. [Java 程序：寻找因子](https://beginnersbook.com/2017/09/java-program-to-find-factorial-using-for-and-while-loop/) 2. [Java 程序：检查素数](https://beginnersbook.com/2014/01/java-program-to-check-prime-number/)