打印出所有5个字符的可能组合

根据以下条件写一段代码，打印出所有5个字符的可能组合：
1. 至少有一个大写字母
2. 至少有一个小写字母
3. 至少有一个数字
4.两个一样的数或者字母不能连在一起（比如 Haxa5是可以的，Haax5就不可以)

public static void print(){
		String upper[] = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"};
		String lower[] = {"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"};
		String num[] = {"0","1","2","3","4","5","6","7","8","9"};
		
		String all[] = {"A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z",
				"a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z",
				"0","1","2","3","4","5","6","7","8","9"};
		String result = "";
		for(int i=0;i<upper.length;i++){
			for(int j=0;j<lower.length;j++){
				for(int m=0;m<num.length;m++){
					for(int n=0;n<all.length;n++){
						for(int k=0;k<all.length;k++){
							result+=upper[i]+lower[j]+num[m]+all[n]+all[k];
							randomGroup(result);
							result="";
						}
					}
				}
			}
		}
		
	}
	
	public static void main(String[] args) {
		print();
	}
	
	/**
	 * 给五个字符的字符串的随机组合
	 *
	 */
	public static void randomGroup(String fiveChar){
		char c[]=fiveChar.toCharArray();
		println(c);
		allCombString(c,0); 
	}

	/**
	 * 相邻字母是否相同
	 * @param c
	 * @return
	 */
	private static boolean isSameLetter(char c[]){
		for(int i=0;i<c.length-1;i++){
			if(c[i] == c[i+1]){
				return false;
			}
		}
		return true;
	}
	
	public static void allCombString(char[] c, int s) {
		int l = c.length;
		if (l - s == 2) {
			char temp = c[l - 1];
			c[l - 1] = c[l - 2];
			c[l - 2] = temp;
			println(c);
		} else {
			for (int i = s; i < l; i++) {
				moveToHead(c, i, s);
				char ct[] = new char[l];
				System.arraycopy(c, 0, ct, 0, l);// 保持其他元素位置不变
				allCombString(ct, s + 1);
			}
		}
	}

	public static void moveToHead(char[] c, int id, int s) {
		if (id > s && id < c.length) {
			char temp = c[id];
			for (int i = id; i > s; i--) {
				c[i] = c[i - 1];
			}
			c[s] = temp;
			println(c);
		}
	}

	public static void println(char[] c) {
		if(isSameLetter(c)){//相邻字符不一样
			System.out.print(new String(c)+"、");
		}
	}