stringdemo.java

it is a good tool to help you study java

class StringDemo{
public static void main(String args[]){
String str1="First";
String str2="Second ";
String str3=str1+str2;
System.out.println(str1);
System.out.println(str2);
System.out.println(str3);
}
}
//java定义了"+"运算符号.用于连接两个String对象