收集面试题（二十七）（关于StringBuffer的测试）

测试输出：

public class StringBufferTest {

	private void method(StringBuffer a, StringBuffer b) {
		a.append(b);
		b = a;

	}

	public static void main(String[] args) {
		StringBufferTest test = new StringBufferTest();
		StringBuffer x = new StringBuffer("A");
		StringBuffer y = new StringBuffer("B");
		test.method(x, y);
		System.out.println(x + "," + y);

	}
}

 输出结果为

 AB,B