public static void main(String[] args){		int num = 0;		String str = "sunjavaIBMjavaOracleJavaHellojavaGoodJava";		Pattern pt = Pattern.compile("java", Pattern.CASE_INSENSITIVE);		Matcher mc = pt.matcher(str);		mc.reset();		while (mc.find()) {			num++;			String gc = mc.group();			System.out.println("第"+num+"次查找出来的字符串是：" + gc);		}		System.out.println("java的总数是：" + num);		mc.reset();		// 把奇数次找到的 java 转化为大写。偶数次找到的 java 转化为小写		while (mc.find()) {			num++;			if (num % 2 == 1) {				String gc = mc.group();				String o1 = gc.toUpperCase();				System.out.println("转换后的字符串是："+o1);			} else {				String gc = mc.group();				String o2 = gc.toLowerCase();				System.out.println("转换后的字符串是："+o2);			}		}	}