可以只用一重循环解决: ArrayList<Integer> list = new ArrayList<Integer>(); int a,b,c; for (int i=0; i<1000; i++) { a=i/100; b=(i%100)/10; c=i%10; if (!(a==b||a==c||b==c)) list.add(i); } System.out.println(list.size() + "个结果: " + list); 共有720个结果
for(int i = 0;i<1000;i++){ int a = i%10; int b = i%100/10; int c = i/100; if(i>10){ if(b==a){ continue; } if(i>99){ if(a==b||b==c||a==c){ continue; } } } System.out.println(i); }
public void method2(){ ArrayList<Integer> list = new ArrayList<Integer>(); int a,b,c; for (int i=100; i<1000; i++) { a=i/100; b=(i%100)/10; c=i%10; if (!(a==b||a==c||b==c)) list.add(i); } System.out.println(list.size() + "个结果: " + list); }
public class ShowNumber {
public static void main(String[] args){
int sum=0;
for(int i=1;i<=9;i++){
for(int j=0;j<=9;j++){
if(j==i)
continue;
for(int m=0;m<=9;m++){
if(m==j||m==i)
continue;
// System.out.println("");
System.out.println(i*100+j*10+m);
sum++;
}
}
}
System.out.println("总共满足条件数字个数:"+sum);
}}
ArrayList<Integer> list = new ArrayList<Integer>();
int a,b,c;
for (int i=0; i<1000; i++) {
a=i/100;
b=(i%100)/10;
c=i%10;
if (!(a==b||a==c||b==c)) list.add(i);
}
System.out.println(list.size() + "个结果: " + list);
共有720个结果
int a = i%10;
int b = i%100/10;
int c = i/100;
if(i>10){
if(b==a){
continue;
}
if(i>99){
if(a==b||b==c||a==c){
continue;
}
}
}
System.out.println(i);
}
for (int i=100
就是个组合公式,初中还是高中学的
int a,b,c;
for (int i=123; i<=987; i++) {
a=i/100;
b=(i%100)/10;
c=i%10;
if (!(a==b||a==c||b==c)) list.add(i);
}
System.out.println(list.size() + "个结果: " + list);
import java.util.ArrayList;public class ShowNumber {
public void method1(){
int sum=0;
for(int i=1;i<=9;i++){
for(int j=0;j<=9;j++){
if(j==i)
continue;
for(int m=0;m<=9;m++){
if(m==j||m==i)
continue;
// System.out.println("");
System.out.println(i*100+j*10+m);
sum++;
}
}
}
System.out.println("总共满足条件数字个数:"+sum); }
public void method2(){
ArrayList<Integer> list = new ArrayList<Integer>();
int a,b,c;
for (int i=100; i<1000; i++) {
a=i/100;
b=(i%100)/10;
c=i%10;
if (!(a==b||a==c||b==c)) list.add(i);
}
System.out.println(list.size() + "个结果: " + list);
}
public static void main(String[] args){
ShowNumber sn=new ShowNumber();
sn.method1();
sn.method2();
}}
for(int i=100;i<1000;i++){
String tmp=String.valueOf(i);
char[] t=tmp.toCharArray();
Set<Object> set=new HashSet<Object>();
for(char t1:t){
set.add(t1);
}
if(set.size()==t.length)list.add(i);
}
System.out.println(list.size());
648个