public class test603
{
public static void main(String args[])
{
String firstName = "Make";
String lastName ="Joeden";
String fullName = firstName+""+lastName;
System.out.println(fullName);
}
}
问题:
问下,firstName+""+lastName; 加号中间为什么要加""呀? 想不通.谢谢!
{
public static void main(String args[])
{
String firstName = "Make";
String lastName ="Joeden";
String fullName = firstName+""+lastName;
System.out.println(fullName);
}
}
问题:
问下,firstName+""+lastName; 加号中间为什么要加""呀? 想不通.谢谢!
firstName+" "+lastName;
就是姓名中间加个空格啊
如果不加,就会变成"MakeJoeden"
比如firstName=Bill
lastName=Gates
写成firstName+" "+lastName
fullName=Bill Gates
如果不写就成BillGates