字符串操作

/**
	 * 取得big中子串sub的个数
	 *
	 * @param p1
	 * @param p2
	 * @return
	 */
	public static int getSubstringNumber(String sub, String big); {	
		String tmp = big;
		int num = 0;	

		for (int i = 0; i < big.length();; i++); {			
			if (tmp.indexOf(sub); != -1); {				
				tmp = tmp.substring(tmp.indexOf(sub);+sub.length(););;	
				num++;			
				i = i + sub.length();;
			}	
			System.out.println("i = "+i);;
		}
		return num;
	}

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一个新的写法：

	import java.util.regex.*;
	private static int getSubstringNumber1(String d, String g); {
		Pattern p = null; //正则表达式
		Matcher m = null; //操作的字符串
		int i = 0;
		p = Pattern.compile(g);;
		m = p.matcher(d);;		
		while (m.find();); {
			//m.appendReplacement(sb, "dog");;			
			i++;
		}
		return i;
	}

------------------------------------------------------------

private static int getSubstringNumber1(String d, String g); {
		Pattern p = null; //正则表达式
		Matcher m = null; //操作的字符串
		int i = 0;
		p = Pattern.compile(g);;
		m = p.matcher(d);;	
		StringBuffer sb = null;
        sb = new StringBuffer();;	
		while (m.find();); {
			m.appendReplacement(sb, "dog");;			
			i++;
		}
		System.out.println(sb);;
		return i;
	}