我的面向对象

洗牌算法

package hello;import java.util.Random;
import java.util.Scanner;class xipai {String k[] = { "红桃A", "红桃2", "红桃3", "红桃4", "红桃5", "红桃6", "红桃7", "红桃8", "红桃9", "红桃10", "红桃J", "红桃Q", "红桃K; \n黑桃A","黑桃2", "黑桃3", "黑桃4", "黑桃5", "黑桃6", "黑桃7", "黑桃8", "黑桃9", "黑桃10", "黑桃J", "黑桃Q", "黑桃K; \n梅花A", "梅花2", "梅花3","梅花4", "梅花5", "梅花6", "梅花7", "梅花8", "梅花9", "梅花10", "梅花J", "梅花Q", "梅花K; \n方片A", "方片2", "方片3", "方片4", "方片5","方片6", "方片7", "方片8", "方片9", "方片10", "方片J", "方片Q", "方片K", "大王", "小王" };void xipi() {for (int i = 0; i < 1000; i++) {Random r = new Random();int x = r.nextInt(51);int y = r.nextInt(51);String w;w = k[x];k[x] = k[y];k[y] = w;}for(int i=0;i<k.length;i++)System.out.print(k[i] + ' ');}}public class hello {public static void main(String[] args) {xipai x = new xipai();x.xipi();}
}

package hello;import java.util.Random;
import java.util.Scanner;class MathUtil {void showme  () {int n=0;Random random = new Random();int rand = 0;// 存储随机数int x = random.nextInt(10);int y = random.nextInt(10);int[][] arrays = new int[x][y];// 声明二维数组
// 给数组赋值for (int i = 0; i <x; i++) {for (int j = 0; j < y; j++) {rand = random.nextInt(10);// 在0-10内随机生成一个正整数arrays[i][j] = rand;}}for (int i = 0; i < x; i++) {for (int j = 0; j < y; j++) {n+=arrays[i][j];System.out.print(' '+arrays[i][j]);	}System.out.println();}System.out.print(n);}}public class hello {public static void main(String[] args) {
MathUtil m=new MathUtil();m.showme();}
}

``

package hello;import java.util.regex.*;class zhengze {String c = "int x,y11,z=1+2*xL+0x5L+姓名+a姓名;";String x = "王五 010-65151234 手机 13812345678 张三 手机号 13177118811，买了138671456件商品，李四 电话 0791-88120410 有1566789件商品";String d="2001.1.1 2112334.2334.21";void cfen() {String[] r = c.split(" |\\+|\\*|\\-|\\%|,|;|=");for (String item : r) {System.out.print(item + ' ');}}void cshi() {Pattern p = Pattern.compile("[a-zA-Z_](\\w)*");Matcher k = p.matcher(c);if (k.find())System.out.println("yes");else {System.out.println("no");}}void shaoma() {Pattern p = Pattern.compile("(13[0-9]|14[579]|15[0-35-9]|17[0-35-8]|18[0-9]){1}\\d{8}");Matcher k = p.matcher(x);while (k.find()) {System.out.println("手机号码: " + k.group());}}void dhaoma() {Pattern a = Pattern.compile("0\\d{2,3}[-]?\\d{7,8}|0\\d{2,3}\\s?\\d{7,8}");Matcher z = a.matcher(x);while (z.find()) {System.out.println("电话号码: " + z.group());}}void day()
{Pattern a = Pattern.compile("\\d{1,4}\\.\\d{1,2}\\.\\d{1,2}");
Matcher z = a.matcher(d);
while (z.find()) {System.out.println("合法日子: " + z.group());}
}
}
public class hello {public static void main(String[] args) {zhengze z = new zhengze();z.cfen();z.cshi();z.shaoma();z.dhaoma();z.day();}
}

package hello;import java.lang.Math;
import java.util.Scanner;class Triangle {private double a, b, c;void debian() {Scanner s = new Scanner(System.in);a = s.nextDouble();c = b = a;}void deyao() {Scanner s = new Scanner(System.in);a = s.nextDouble();b = s.nextDouble();
if(2*b<a)c=a;
else c=b;}void putri() {Scanner s = new Scanner(System.in);a = s.nextDouble();b = s.nextDouble();c = s.nextDouble();}double geta() {return a;}double getb() {return b;}double getc() {return c;}void show(){System.out.println("普通三角形：a="+a+"b="+b+"c="+c);}}class zhijiao extends Triangle {double a, b, c;public zhijiao() {System.out.print("请输入:");}void towzhi() {this.deyao();a = this.geta();b = this.getb();c = Math.sqrt(a * a + b * b);if (a + b <= c || b + c <= a || a + c <= b) {a = 3;b = 4;c = 5;}}void thzhi() {this.putri();a = this.geta();b = this.getb();c = this.getc();if (a * a + b * b != c * c || b * b + c * c != a * a || a * a + c * c != b * b) {a = 3;b = 4;c = 5;}}void show(){System.out.println("直角三角形：a="+a+"b="+b+"c="+c);}}public class hello {public static void main(String[] args) {Triangle t1=new Triangle();zhijiao z1=new zhijiao();t1.debian();t1.show();t1.deyao();t1.show();t1.putri();t1.show();z1.towzhi();z1.show();}
}

package hello;import java.lang.Math;
import java.util.Scanner;class Triangle {private double a, b, c;private static final int total = 5;private static int count = 0;private Triangle(double x) {a = x;b = x;c = x;count++;}private Triangle(double x, double y) {a = x;b = x;c = y;count++;}private Triangle(double x, double y, double z) {a = x;b = y;c = z;count++;}private static boolean limit(double x, double y, double z) {return (x > 0 && y > 0 && z > 0 && x + y > z && x + z > y && y + z > x && count < total);}public static Triangle creat(double x) {if (limit(x, x, x)) {return new Triangle(x);} else {return null;}}public static Triangle creat(double x, double y) {if (limit(x, x, y)) {return new Triangle(x, y);}else if (limit(x, y, y)) {return new Triangle(y, x);} else {return null;}}public static Triangle creat(double x, double y, double z) {if (limit(x, y, z)) {return new Triangle(x, y, z);}return null;}
}
public  class hello {public static void main(String[] args) {Triangle[] t=new Triangle[10];t[0]=Triangle.creat(0);t[1]=Triangle.creat(1);t[2]=Triangle.creat(1,2);t[3]=Triangle.creat(-1,2,3);t[4]=Triangle.creat(2,2,3);t[5]=Triangle.creat(2,2,3);t[6]=Triangle.creat(2,2,3);for(Triangle x:t){System.out.println(x);}}
}

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