String的subString()和toUpCase()用法

/**
 * subString和toUpcase
 * @author Administrator
 *
 */
public class SubStringUsage {
public static void main(String[] args) {
String str$1 = "HelloWorld!";
System.out.println(str$1.substring(1));

//字符串值不变
System.out.println(str$1);

System.out.println(str$1.substring(1,2)); //Index example: HelloWorld  0 H 1 e 2

System.out.println(str$1.substring(1,2).toUpperCase());

}

}

输出结果:

elloWorld!
HelloWorld!
e
E