2-例子
public class Datatype
{  public static void main(String args[])
  { byte a=120;short b=250;int c=2200;long d=500000;
    char e='花';float f=11111.111f;double g=11111111.111;
    boolean 男=true;boolean 女=false;
   System.out.println("a=  "+a); System.out.println("b=  "+b); 
   System.out.println("c=  "+c); System.out.println("d=  "+d); 
   System.out.println("e=  "+e); System.out.println("f=  "+f); 
   System.out.println("g=  "+g); System.out.println("男=  "+男); 
   System.out.println("女=  "+女); 
  }
}