/**
	 * 打印九九乘法口诀 方法一
	 */
	public void chengfa(){
		  for(int i=1;i<=9;i++){
			  int j = 1;
			  while(j<=i){
				  System.out.print(j+"*"+i+"="+i*j+ " ");
				  j++;
			  }
			  System.out.println();
				  
		  }
	}
	
	/**
	 * 打印九九乘法口诀 方法二
	 */
	public void chengfa2(){
		for(int i =1,j =1;j <=9;i++){
			System.out.print(i+"*"+j+"="+i*j+" ");
			if(i==j){
				i=0;
				j++;
				System.out.println();
			}
		}
	}
	
	
	/**
	 *去除字符串中多余的空格，只保留一个 
	 */
	public void removeEmptySpace(){
		String testStr = "I am   happy to   introduce  myself to  you here!";
		StringBuffer sb = new StringBuffer();
		boolean flg = false;
		for(int i=0;i<testStr.length();i++){
			char cha = testStr.charAt(i);
			//System.out.println(cha);
			if(cha == ' '&& flg){
				sb.append(cha);
				flg = false;
			}else if(cha != ' '){
				flg =true;
				sb.append(cha);
			}
		}
		System.out.println(sb.toString());
	}
	
	
	/**
	 * 压缩字符串
	 * Compress :AAABCCf  ==> 3AB2Cf
	 */
	public void compressText(String text){
		int sum =0;
		StringBuffer sb = new StringBuffer();
		char tmp ;
		for(int i=0;i<text.length();i++){
			char cha = text.charAt(i);
			tmp = (i>0)?text.charAt(i-1):text.charAt(i);
			if(tmp == cha){
				sum ++;
				if(i ==text.length()-1){
					sb.append(sum>1?(sum+""+tmp):tmp);
				}
			}else{
				sb.append(sum>1?(sum+""+tmp):tmp);
				sum = 1;
				tmp = text.charAt(i);
				
				if(i ==text.length()-1){
					sb.append(tmp);
				}
			}
		}
		System.out.println("compressText is:"+sb.toString());
	}