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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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