2014.10.25数组与排序

1. 求最大值与最小值

   package com.lovo;
   /*
    *求最大值与最小值
    */
   public class Test01 {
   
   	public static void main(String[] args) {
   		int[] a = new int[10];
   		
   		for(int i = 0; i < a.length; i++) {
   			a[i] = (int) (Math.random() * 99 + 1);
   			System.out.print(a[i] + "\t");
   		}
   		System.out.println();
   		
   		int max, min;
   		max = min = a[0];
   		for(int i = 1; i < a.length; i++) {
   			if(a[i] > max) {
   				max = a[i];
   			}
   			else if(a[i] < min) {
   				min = a[i];
   			}
   		}
   		System.out.println("最大值: " + max);
   		System.out.println("最小值: " + min);
   	}
   	
   }
   

   
   
2. 摇骰子

   package com.lovo;
   
   public class Test02 {
   
   	public static int roll() {
   		return (int) (Math.random() * 6 + 1);
   	}
   	
   	public static void main(String[] args) {
   		String[] strs = {"banana", "waxberry", "kiwi", "grape"};
   		System.out.println(strs[2]);
   		
   		int[] f = new int[6];
   		
   		for(int i = 1; i <= 6000; ++i) {
   			int face = roll();
   			f[face - 1]++;
   		}
   		
   		for(int i = 0; i < f.length; i++) {
   			System.out.println(i + 1 + "点摇出了" + f[i] + "次");
   		}
   	}
   }
   

   
   
3. 斐波拉切数列

   package com.lovo;
   
   public class Test03 {
   
   	public static void main(String[] args) {
   		int[] f = new int[20];
   		f[0] = f[1] = 1;
   		
   		for(int i = 2; i < f.length; i++) {
   			f[i] = f[i - 1] + f[i - 2];
   		}
   		
   		// Java 5+ for-each循环
   		for(int x : f) {
   			System.out.println(x);
   		}
   	}
   }
   

   
   
4. 成绩统计

   package com.lovo;
   
   import java.util.Scanner;
   
   public class Test04 {
   
   	public static void main(String[] args) {
   		Scanner sc = new Scanner(System.in);
   		double[] scores = new double[6];
   		
   		String[] names = {"张飞", "关羽", "马超", "黄忠", "赵云", "魏延"};
   		
   		double totalScore = 0;
   
   		for(int i = 0; i < scores.length; i++) {
   			System.out.print("请输入" + names[i] + "的成绩: ");
   			scores[i] = sc.nextDouble();
   			totalScore += scores[i];
   		}
   		
   		System.out.printf("平均分: %.1f\n", totalScore / scores.length);
   		
   		double maxScore = scores[0], minScore = scores[0];
   		int maxIndex = 0, minIndex = 0;
   		for(int i = 1; i < scores.length; i++) {
   			if(scores[i] > maxScore) {
   				maxScore = scores[i];
   				maxIndex = i;
   			}
   			else if(scores[i] < minScore) {
   				minScore = scores[i];
   				minIndex = i;
   			}
   		}
   		
   		System.out.println(names[maxIndex] + "考了最高分: " + maxScore);
   		System.out.println(names[minIndex] + "考了最低分: " + minScore);
   		
   		sc.close();
   	}
   }