stringbuffertest.java

来自「SCJP认证考试资料」· Java 代码 · 共 11 行

class StringBufferTest{
    public static void main(String[] args){
	StringBuffer result = new StringBuffer();
	StringBuffer s = null;
	System.out.println(s);
	result.append(s);
	result.insert(0,"123");
	System.out.println(result);
    }
}