ex_6_2_2.java

JAVA程序设计与实践.rar

/*
 * 文件名:ex_6_2_2.java
 * 说  明:说明charAt()和setCharAt()的使用
 */
class ex_6_2_2{
	public static void main(String args[]) {
		StringBuffer sb = new StringBuffer("Hello");
		System.out.println("buffer before = " + sb);
		System.out.println("charAt(1) before = " + sb.charAt(1));
		sb.setCharAt(1, 'i');
		sb.setLength(2);
		System.out.println("buffer after = " + sb);
		System.out.println("charAt(1) after = " + sb.charAt(1));
	}
}