import java.util.Random;public class add {
public static void main(String[] args){
Random r = new Random();
for(int i=0;i<10;i++){
int x = r.nextInt();
System.out.println(x);
}
}
}
public static void main(String[] args){
Random r = new Random();
for(int i=0;i<10;i++){
int x = r.nextInt();
System.out.println(x);
}
}
}
for(int index=0;index<54;index++) {
cards[index]=false;
}
java.util.Random r = new java.util.Random();
int x;
for(int index=0;index<54;index++){
do {
x = java.lang.Math.abs(r.nextInt())%54;
} while (cards[x]!=false);
cards[x]=true;
System.out.print(x+" ");
}
System.out.println();
{
int k = (int)(Math.random() * 52D);
k++;
card cardTemp = cardSet2[j];
cardSet2[j] = cardSet2[k];
cardSet2[k] = cardTemp;
}
上面有一章关于 《对象的容纳》对这问题有
详细的描述
这是个比较有意思的东西
哎!!!!
import java.util.Random;public class add {
public static void main(String[] args){
Random r = new Random();
int[] f = new int[10];
int[] f1 = new int[10];for(int i=0;i<10;i++){
f[i] = r.nextInt();
f1[i] = i;
}
for(int i = 0;i<10;i++){
for(int j = i;j<10;j++){
if(f[i]<f[j]){
int temp = f1[j];
f1[j] = f1[i];
f1[i] = temp;
}
}
}
for(int i = 0;i<10;i++){
System.out.println(f1[i]);
}}
}
import java.util.*;public class add {
public static void main(String[] args){
Random r = new Random();
int[] f = new int[10];
int[] f1 = new int[10];
Date date = new Date();for(int i=0;i<10;i++){
r.setSeed(date.getTime()*i);
f[i] = r.nextInt();
f1[i] = i;
}
for(int i = 9;i >=0;i--){
for(int j= 0;j<i;j++){
if(f[j]<f[j+1]){
int temp = f1[j];
f1[j] = f1[j+1];
f1[j+1] = temp;
temp = f[j];
f[j] = f[j+1];
f[j+1] = temp;
}
}
}
for(int i = 0;i<10;i++){
System.out.println(f1[i]);
}}
}
public Card(int id) {
this.id = id;
}
// attributes
private int id;
// methods
public String toString() {
return Integer.toString(id);
}
public static void main(String[] args) {
List cards = new ArrayList();
//... add cards;
for(int i = 0; i < 54; i++) {
cards.add(new Card(i));
}
Collections.shuffle(cards,new Random());
for(int i = 0; i < cards.size(); i++) {
System.out.println(cards.get(i));
}
}
}
jdk有现成的api干吗不用?