在已知字符串中查找给定的子串，若找到返回位置，找不到返回-1

import java.util.regex.*;

public class SubString {

	/**
	 * @param args
	 */
	public int intstr(String str1, String str2){
		Pattern pattern = Pattern.compile(str2);
		Matcher matcher = pattern.matcher(str1);
		int index = 0;
		while(matcher.find()){
			index++;
			//System.out.println(matcher.group(0));
			if(matcher.group(0).equals(str2)){
				index = matcher.start();
				break;
			}else{
				index = -1;
			}
		}
		return index;
	}
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SubString ss = new SubString();
		String str1 = "zsdcd java ddchjavddsjava";
		String str2 = "java";
		System.out.println(ss.intstr(str1, str2));

	}

}

在已知字符串中查找给定的子串，若找到返回位置，找不到返回-1，Java实现，应用正则表达事的Pattern静态方法compile():