java语言程序定义ab,输出所有排列组合aa,ab,ba,bb！

其他 2021-01-31 08:35:59 阅读次数: 0

public class Permutation {
public static void main(String[] args) {
char[] chs = {‘a’,‘b’,‘c’};
per(new char[3], chs, 3-1);
}
public static void per(char[] buf, char[] chs, int len){
if(len == -1){
for(int i=buf.length-1; i>=0; --i)
System.out.print(buf[i]);
System.out.println();
return;
}
for(int i=0; i<chs.length; i++){
buf[len] = chs[i];
per(buf, chs, len-1);
}
}
}

public class Arrange {
public static void main(String[] args) {
char[] chs = {‘a’,‘b’,‘c’};
arrange(chs, 0, chs.length);
}
public static void arrange(char[] chs, int start, int len){
if(start == len-1){
for(int i=0; i<chs.length; ++i)
System.out.print(chs[i]);
System.out.println();
return;
}
for(int i=start; i<len; i++){
char temp = chs[start];
chs[start] = chs[i];
chs[i] = temp;
arrange(chs, start+1, len);
temp = chs[start];
chs[start] = chs[i];
chs[i] = temp;
}
}
}

public class Comb {
public static void main(String[] args) {
char[] chs = {‘a’,‘b’,‘c’};
comb(chs);
}

public static void comb(char[] chs) {
	int len = chs.length;
	int nbits = 1 << len;
	for (int i = 0; i < nbits; ++i) {
		int t;
		for (int j = 0; j < len; j++) {
			t = 1 << j;
			if ((t & i) != 0) { // ??????1????1
				System.out.print(chs[j]);
			}
		}
		System.out.println();
	}
}

}

public class Permutation {
public static void main(String[] args) {
char[] chs = {‘a’,‘b’};
per(new char[2], chs, 2-1);
}
public static void per(char[] buf, char[] chs, int len){
if(len == -1){
for(int i=buf.length-1; i>=0; --i)
System.out.print(buf[i]);
System.out.println();
return;
}
for(int i=0; i<chs.length; i++){
buf[len] = chs[i];
per(buf, chs, len-1);
}
}
}

aa
ab
ba
bb

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public class Permutation {
public static void main(String[] args) {
char[] chs = {’?’,’?’};
per(new char[2], chs, 2-1);
}
public static void per(char[] buf, char[] chs, int len){
if(len == -1){
for(int i=buf.length-1; i>=0; --i)
System.out.print(buf[i]);
System.out.println();
return;
}
for(int i=0; i<chs.length; i++){
buf[len] = chs[i];
per(buf, chs, len-1);
}
}
}

??
??
??
??

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public class Permutation {
public static void main(String[] args) {
char[] chs = {’?’,’?’};
per(new char[2], chs, 2-1);
}
public static void per(char[] buf, char[] chs, int len){
if(len ==-1){
for(int i=buf.length-1; i>=0; --i)
System.out.print(buf[i]);
System.out.println();
return;
}
for(int i=0; i<chs.length; i++){
buf[len] = chs[i];
per(buf, chs,len-1);
}
}
}

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??
??
??
??

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import java.util.ArrayList;
import java.util.List;

public class CompoundString { 

private static void generate(int n,List<String> results) {   
    if(n==1){
    	return;
    }
	List<String> resultsTemp_A = new ArrayList<String>();
	List<String> resultsTemp_B = new ArrayList<String>();
	for(String str : results){
    	String temp_A = str+"A";
    	resultsTemp_A.add(temp_A);
    	String temp_B = str+"B";
    	resultsTemp_B.add(temp_B);
    }
	//??results??????????????main????results???
	results.clear();
	results.addAll(resultsTemp_A);
	results.addAll(resultsTemp_B);
	generate(n-1, results);  // recursive
}  

public static void main(String[] args) {  
	List<String> results = new ArrayList<String>();
	results.add("A");
	results.add("B");
	generate(3, results);
	for(String str : results){
		System.out.println(str);
	}
}

}

AAA
BAA
ABA
BBA
AAB
BAB
ABB
BBB

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import java.util.ArrayList;
import java.util.List;

public class CompoundString { 

private static void generate(int n,List<String> results) {   
    if(n==1){
    	return;
    }
	List<String> resultsTemp_A = new ArrayList<String>();
	List<String> resultsTemp_B = new ArrayList<String>();
	for(String str : results){
    	String temp_A = str+"A";
    	resultsTemp_A.add(temp_A);
    	String temp_B = str+"B";
    	resultsTemp_B.add(temp_B);
    }
	//??results??????????????main????results???
	results.clear();
	results.addAll(resultsTemp_A);
	results.addAll(resultsTemp_B);
	generate(n-1, results);  // recursive
}  

public static void main(String[] args) {  
	List<String> results = new ArrayList<String>();
	results.add("A");
	results.add("B");
	generate(2, results);
	for(String str : results){
		System.out.println(str);
	}
}

}

AA
BA
AB
BB

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import java.util.ArrayList;
import java.util.List;
/**

  • @author lyon_yao

*/
public class Test {
public static void main(String []a){
List list=new ArrayList();
String value=“0123456789abcdefghijklmnopqrstuvwmnxyzABCDEFGHIJKLMNOPQRSTUVWXYZ”;
char[] chars=value.toCharArray();
for(char c:chars){
list.add(String.valueOf©);
}
System.out.println(list);
List result=new ArrayList();
for(char c:chars){
result.add(String.valueOf©);
}
new Test().run(list,1);
}
public void run(List last,int index){
int size = last.size();
for(int j=0;j<size-index;j++){
String temp="";
for(int i=0;i<index&&i+j<size;i++){
temp+=last.get(j+i);
}
System.out.println(temp);
}
if(index<size){
run(last,++index);
}
}
}

public class TestPL {
static String[] array = {“0”,“1”,“2”,“3”};

public static void main(String[] args) {
	for(int i=0;i<array.length;i++){
		sort("",i+1);
	}
}

public static void sort(String leftString, int leftLen){
	if(leftLen == 0){
		System.out.println(leftString);
		return;
	}
	for(int i=0;i<array.length;i++){
		if(leftString.indexOf(array[i]) != -1){
			continue;
		}else{
			sort(leftString+array[i],leftLen-1);
		}
	}
}

}

public class Permutation {
public static void main(String[] args) {
char[] chs = {‘a’,‘b’,‘c’};
per(new char[3], chs, chs.length-1);
}
public static void per(char[] buf, char[] chs, int len){
if(len == -1){
for(int i=buf.length-1; i>=0; --i)
System.out.print(buf[i]);
System.out.println();
return;
}
for(int i=0; i<chs.length; i++){
buf[len] = chs[i];
per(buf, chs, len-1);
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){ 

	for(int i = 1;i <= 10;i++){
		for (int j = 1;j<=i;j++){
			System.out.print(i+"*"+j+"="+i*j+"\t");
		}
		
		System.out.print("\n");
	}
}

}

1=1
21=2 22=4
31=3 32=6 33=9
41=4 42=8 43=12 44=16
51=5 52=10 53=15 54=20 55=25
61=6 62=12 63=18 64=24 65=30 66=36
71=7 72=14 73=21 74=28 75=35 76=42 77=49
81=8 82=16 83=24 84=32 85=40 86=48 87=56 88=64
91=9 92=18 93=27 94=36 95=45 96=54 97=63 98=72 99=81
101=10 102=20 103=30 104=40 105=50 106=60 107=70 108=80 109=90 10*10=100

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public class test99{
public static void main(String[] args){
/*
for ???9*9???
*/
for (int i = 1; i <= 9; i++){
for (int j = 1; j <= i; j++){ 

			System.out.print(" " + i + "*" + j + "=" + (i * j)+"\t");//   "\t"??JAVA?????????,??????????????????
			if(i == j){
				System.out.print("\n");//???????????????
			}
			
		}
	}
}

}

11=1
21=2 22=4
31=3 32=6 33=9
41=4 42=8 43=12 44=16
51=5 52=10 53=15 54=20 55=25
61=6 62=12 63=18 64=24 65=30 66=36
71=7 72=14 73=21 74=28 75=35 76=42 77=49
81=8 82=16 83=24 84=32 85=40 86=48 87=56 88=64
91=9 92=18 93=27 94=36 95=45 96=54 97=63 98=72 9*9=81

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???
public class MultiplicationTable1{
public static void main(String[] args){
String[] a = {“0”,“1”};

			         System.out.print( a );
	}
}

???
public class MultiplicationTable1{
public static void main(String[] args){
String[] a = {“0”,“1”};
for(int i = 0;i < 2;i++)
for(int j = 0;j < 2;j++)
System.out.print( a[i] );
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String[] a = {“0”,“1”};
for(int i = 0;i < 2;i++){
for (int j = 0;j<2;j++){
System.out.print( a[i]+"" );
}
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String[] a = {“0”,“1”};
for(int i = 0;i < 2;i++){
for (int j = 0;j<2;j++){
System.out.print( a[i] );
}
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String[] a = {“0”,“1”};
for (int i = 0; i < a.length; i++) {
list.add(Integer.parseInt(a[i]));
}
System.out.println(list);
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String[] a = {“0”,“1”};
for(int i = 0;i < 2;i++){
for (int j = 0;j<2;j++){
System.out.print( a );
}
}
}
}

String[] arr = {“a”,“b”};//???
for(int i=0;i<arr.length;i++){//???
System.out.println(arr[i]);//???
}

String[] bArray = {“a”,“b”,“c”, “d”, “e”};

for(int i=0;i<sums.length;i++){
System.out.println(sums[i]);
}

public class MultiplicationTable1{
public static void main(String[] args){
String[] arr = {“a”,“b”};
for(int i=0;i<arr.length;i++){
System.out.println(arr[i]);
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String [] names ={“James”, “Larry”, “Tom”, “Lacy”};
for( String name : names ) {
System.out.print( name );
System.out.print(",");
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String [] as ={"?", “?”};
for( String a : as ) {
System.out.print( a );
System.out.print("");
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String [] as ={"?", “?”};
for(String a = 0;a < 2;a++){
System.out.print( a );
System.out.print("");
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String [] as ={"?", “?”};
for( String a : as ) {
System.out.print( a );
}
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String [] a ={"?", “?”};
for(int i = 0;i < 2;i++)
System.out.print( a[i] );
}
}

public class MultiplicationTable1{
public static void main(String[] args){
String [] as ={"???", “?”, “?”, “?”};
for( String a : as ) {
System.out.print( a );
System.out.print("");
}
}
}

正确例题
public class MultiplicationTable1{
public static void main(String[] args){
String[] a = {“a”,“b”};
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
System.out.println(a[i]+a[j]);
}
}

aa
ab
ba
bb

[Process completed - press Enter]

正确例题
public class Permutation {
public static void main(String[] args){
String[] a = {“负”,“正”};
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
System.out.println(a[i]+a[j]);
}
}

负负
负正
正负
正正

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正确例题
public class Permutation {
public static void main(String[] args){
String[] a = {“0”,“1”};
for(int i=0;i<2;i++)
for(int j=0;j<2;j++)
for(int k=0;k<2;k++)
System.out.println(a[i]+a[j]+a[k]);
}
}

000
001
010
011
100
101
110
111

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正确例题
public class Permutation {
public static void main(String[] args){
String[] a = {“0”,“1”,“2”};
for(int i=0;i<3;i++)
for(int j=0;j<3;j++)
for(int k=0;k<3;k++)
System.out.println(a[i]+a[j]+a[k]);
}
}

000
001
002
010
011
012
020
021
022
100
101
102
110
111
112
120
121
122
200
201
202
210
211
212
220
221
222

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