第一题
package com.pcx.day2; /* * 九九乘法表 */ public ????public ????????for (int ????????????for (int ????????????????System.out.print(j+"*"+i+"="+i*j+"\t"); ????????????} ????????????System.out.println(); ????????} ???????? ????????System.out.println("=========================================="); ????????for (int ????????????for (int ????????????????System.out.print(j+"*"+i+"="+i*j+"\t"); ????????????} ????????????System.out.println(); ????????} ????} } |
第二题
package com.pcx.day2; /** * 在控制台打印菱形 * @author Administrator * */ public ????public ????????//前三行 ????????for (int ????????????for (int ????????????????System.out.print(" "); ????????????} ????????????for (int ????????????????System.out.print("*"); ????????????} ????????????System.out.println(); ????????} ????????//后三行 ????????for (int ????????????for (int ????????????????System.out.print(" "); ????????????} ????????????for (int ????????????????System.out.print("*"); ????????????} ????????????System.out.println(); ????????} ????} } |
package com.pcx.day2; ? import java.util.Arrays; ? /* * 冒泡排序 */ public ????public ????????int []array={2,1,3,4,6,67,9,3,54}; ????????for (int ????????????for (int ????????????????if (array[i]>array[j]) { ????????????????????int ????????????????????array[i]=array[j]; ????????????????????array[j]=temp; ????????????????} ????????????} ????????} ????????System.out.println(Arrays.toString(array)); ????} }
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package com.pcx.day2; /* * 100内的素数 * 素数的因子只有1和他本身 * 对正整数n,如果用2到之间的所有整数去除,均无法整除,则n为质数 */ public ????public ????????for (int ????????????if (x%i==0) { ????????????????return ????????????} ????????} ????????return ????} ???? ????public ????????for (int ????????????if (isSu(i)) { ????????????????System.out.println(i+"是素数"); ????????????} ????????} ????} } |