练习

public class a {

public static void main(String[] arg){
//注释

System.out.println("Hellow wold");
String a=("我在这里");
a=("他在这里");
System.out.println(a);
byte t=-128;
System.out.println(t);
short s=9999;
System.out.println(s);
int l=123;
System.out.println(l);
float h=123.54555547444F;
System.out.print(h);

}

}