Java之两个字符串内容的交换

1、定义第三个字度符串变量：

String s1="s1s1s1s1s1";
String s2="s2s2s2s2s2s2";
String s3="";
s3=s1;
s1=s2;
s2=s3;

2、使用StringBuffer

String s1 = "s1s1s1s1s1";
String s2 = "s2s2s2s2s2s2";
StringBuffer buffer = new StringBuffer();
buffer.append(s1).append(s2);
s1 = buffer.toString().substring(s1.length());
s2 = buffer.toString().substring(0,buffer.length()-s1.length());