//StringOp.java
//String類字符串的常用操作
public class StringOp 
{
	public static void main(String args[]) 
	{
		String s1="AbCde";
		String s2="bC";
		System.out.println("字符串s1為："+s1);
		System.out.println("字符串s1的長度為："+s1.length());
		System.out.println("字符串s2為："+s2);
		System.out.println("字符串s2的長度為："+s2.length());
		System.out.println("s1大寫形式是:"+s1.toUpperCase());
		System.out.println("s2小寫形式是:"+s2.toLowerCase());
		for (int i=0;i<s1.length();i++)
			{	
			System.out.println("s1中的第"+i+"個字符是："+s1.charAt(i));
			}
		System.out.println("s1+s2="+s1+s2);
		if(s1.compareTo(s2)==0)
			System.out.println("s1與s2相等");
		else
			System.out.println("s1與s2不相等");
		if (s1.indexOf(s2)!=-1)
			{
			System.out.println("s2是s1的子串");
			System.out.println("s2在s1中的位置為："+s1.indexOf(s2));
			}
		else
			System.out.println("s2不是s1的子串");
		System.out.println("經過以上操作，s1與s2沒有變化：");
		System.out.println("字符串s1仍然為："+s1);
		System.out.println("字符串s2仍然為："+s2);
	}
}