package digit;
import java.util.Arrays;


public class compareStringArray {

    private static final String CHAR_SET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    private static final int DEFAULT_LENGTH = 2;

    public static String generateRandomString(int length) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int index = (int) (Math.random() * CHAR_SET.length());
            sb.append(CHAR_SET.charAt(index));
        }
        return sb.toString();
    }
    public static void main(String[] args) {
        String[] stringArray = new String[100];
        for(int i=0;i<stringArray.length;i++){
            String randomString = generateRandomString(DEFAULT_LENGTH);
            stringArray[i] = randomString;
        }
        System.out.println(Arrays.toString(stringArray));


        int count = 0;
        StringBuilder sb1 = new StringBuilder();
        for(int i=0;i<stringArray.length-1;i++){
            for(int j=i+1;j<stringArray.length;j++){
                if(stringArray[j].equalsIgnoreCase(stringArray[i])){
                    count++;
                    sb1.append(stringArray[i]).append(" ");
                    break;
                }
            }
        }
        System.out.println("The number of same strings is: "+count);
        System.out.println("The same strings are: "+sb1.toString());
    }
}

package digit;
import java.util.Arrays;


public class compareStringArray {

    private static final String CHAR_SET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    private static final int DEFAULT_LENGTH = 2;

    public static String generateRandomString(int length) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int index = (int) (Math.random() * CHAR_SET.length());
            sb.append(CHAR_SET.charAt(index));
        }
        return sb.toString();
    }
    public static void main(String[] args) {
        String[] stringArray = new String[1000];
        for(int i=0;i<stringArray.length;i++){
            String randomString = generateRandomString(DEFAULT_LENGTH);
            stringArray[i] = randomString;
        }
        System.out.println(Arrays.toString(stringArray));


        int count = 0;
        StringBuilder sb1 = new StringBuilder();
        for(int i=0;i<999;i++){
            for(int j=0;j<999-i;j++){
                if(stringArray[j].equals(stringArray[j+1])){
                    count++;
                    sb1.append(stringArray[i]).append(" ");
                }
            }
        }
        System.out.println("The number of same strings is: "+count);
        System.out.println("The same strings are: "+sb1.toString());
    }
}

package digit;
import java.util.Arrays;


public class compareStringArray {

    private static final String CHAR_SET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    private static final int DEFAULT_LENGTH = 2;

    public static String generateRandomString(int length) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int index = (int) (Math.random() * CHAR_SET.length());
            sb.append(CHAR_SET.charAt(index));
        }
        return sb.toString();
    }
    public static void main(String[] args) {
        String[] stringArray = new String[1000];
        for(int i=0;i<stringArray.length;i++){
            String randomString = generateRandomString(DEFAULT_LENGTH);
            stringArray[i] = randomString;
        }
        System.out.println(Arrays.toString(stringArray));


        int count = 0;
        StringBuilder sb1 = new StringBuilder();
        for(int i=0;i<999;i++){
            for(int j=0;j<999-i;j++){
                if(stringArray[j].equals(stringArray[j+1])){
                    count++;
                    sb1.append(stringArray[i]).append(" ");
                }
            }
        }
        System.out.println("The number of same strings is: "+count);
        System.out.println("The same strings are: "+sb1.toString());
    }
}

package digit;
import java.util.Arrays;


public class compareStringArray {

    private static final String CHAR_SET = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    private static final int DEFAULT_LENGTH = 2;

    public static String generateRandomString(int length) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < length; i++) {
            int index = (int) (Math.random() * CHAR_SET.length());
            sb.append(CHAR_SET.charAt(index));
        }
        return sb.toString();
    }
    public static void main(String[] args) {
        String[] stringArray = new String[1000];
        for(int i=0;i<stringArray.length;i++){
            String randomString = generateRandomString(DEFAULT_LENGTH);
            stringArray[i] = randomString;
        }
        System.out.println(Arrays.toString(stringArray));


        int count = 0;
        StringBuilder sb1 = new StringBuilder();
        for(int i=0;i<999;i++){
            for(int j=0;j<999-i;j++){
                if(stringArray[j].equals(stringArray[j+1])){
                    count++;
                    sb1.append(stringArray[i]).append(" ");
                }
            }
        }
        System.out.println("The number of same strings is: "+count);
    }
}

public static void main(String[] args) {
		String[] strs = new String[100];
		int[] indexs = new int[100];
		int k = 0;
		boolean n = false;

		System.out.format("一共生成%d个随机字符串%n", strs.length);
		for (int i = 0; i < strs.length; i++) {
			strs[i] = getRandomStr(2);
			System.out.format("%s ", strs[i]);
			if ((i + 1) % 20 == 0)
				System.out.println();
		}

		System.out.println();

		for (int i = 0; i < strs.length; i++) {
			for (int j = i + 1; j < strs.length; j++) {
				if (strs[i].equals(strs[j]) == true) {
					for (int m = 0; m < k; m++)
						if (strs[i].equals(strs[indexs[m]])) {
							n = true;
							break;
						}
					if (n == false) {
						indexs[k++] = i;
						break;
					}
					n = false;
				}
			}
		}

		System.out.format("共找到%d个重复字符串%n", k);
		if (k > 1)
			System.out.println("分别是:");
		for (int i = 0; i < k; i++) {
			System.out.format("%s[%d] ", strs[indexs[i]], indexs[i]);

		}
		System.out.println();
	}

public static void main(String[] args) {
		String[] strs = new String[100];
		int[] indexs = new int[100];
		int k = 0, n = 0;

		System.out.format("一共生成%d个随机字符串%n", strs.length);
		for (int i = 0; i < strs.length; i++) {
			strs[i] = getRandomStr(2);
			System.out.format("%s ", strs[i]);
			if ((i + 1) % 20 == 0)
				System.out.println();
		}

		System.out.println();

		for (int i = 0; i < strs.length; i++) {
			for (int j = i + 1; j < strs.length; j++) {
				if (strs[i].equals(strs[j]) == true) {
					for (int m = 0; m < k; m++)
						if (strs[i].equals(strs[indexs[m]]))
							n++;
					if (n == 0)
						indexs[k++] = i;
					else
						n = 0;
				}
			}
		}

		System.out.format("共找到%d个重复字符串%n", k);
		if (k > 1)
			System.out.println("分别是:");
		for (int i = 0; i < k; i++) {
			System.out.format("%s[%d] ", strs[indexs[i]], indexs[i]);

		}
		System.out.println();
	}

public class test{
    public static void main(String[] args) {
        String[] s_array=new String[100];
        for(int i=0;i<s_array.length;i++){
            s_array[i]=getString();
        }
        int count=0;
        StringBuffer s=new StringBuffer("分别是:\n");
        for(int i=0;i<s_array.length;i++){
            for(int j=i+1;j<s_array.length;j++){
                if(s_array[i].equals(s_array[j])){
                    count++;
                    s.append(s_array[i]);
                    s.append(" ");
                }
            }
        }
        System.out.printf("总共有%d种重复的字符串:\n",count);
        System.out.println(s);

    }
    public static String getString(){
        char[] c_array=new char[2];
        int random=(int)(Math.random()*3);
        for(int i=0;i<c_array.length;i++) {
            switch (random) {
                case 0:
                    c_array[i] = (char) (int) (Math.random() * 26 + 'a');
                    break;
                case 1:
                    c_array[i] = (char) (int) (Math.random() * 26 + 'A');
                    break;
                case 2:
                    c_array[i] = (char) (int) (Math.random() * 10 + '0');
                    break;
            }
        }
        String s=String.valueOf(c_array);
        return s;
    }
}

if(i==j)continue;
                    if(strs[i].equalsIgnoreCase(strs[j])){
                        if(j<i)break;
                        count++;