java 用StringBuffer类写一个例子

public class Test
{
public static void main(String[] args)
{
StringBuffer a = new StringBuffer("One");
StringBuffer b = new StringBuffer("Two");
System.out.println ("begin a is :" + a);
System.out.println ("begin b is :" + b);
System.out.println ("swap start");
Test.swap(a,b);
System.out.println ("swap end\n");
System.out.println("now a is " + a +"\nnow b is " + b);
}

static void swap(StringBuffer a1, StringBuffer b1)
{
System.out.println ("a1 = " + a1);
System.out.println ("b1 = " + b1);
System.out.println ("append( \" more\")");
a1.append(" more");
System.out.println ("a1 = " + a1);
b1 = a1;
b1.append(" more");
System.out.println ("b1 = " + b1);
}
}

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