Java unusually grammar

if expression:

 int i = (a>b)?a:b;

for each expression:

for(Object o: new ArrayList())...{
   // ...... your code
}

An enum type is a type whose fields consist of a fixed set of constants

enum Day ...{
    SUNDAY("1"), MONDAY("2"), TUESDAY("3"), WEDNESDAY("4"), 
    THURSDAY("5"), FRIDAY("6"), SATURDAY("7");
    
    Day(String s)...{
        num = s;
    }
    String num;
}

changed parameters method

public void write(Object... objs) ...{
　　　 for (Object obj: objs)
　　　　　System.out.println(obj);
　　}

generics: don't need class casting

static void expurgate(Collection<String> c) ...{
    for (Iterator<String> i = c.iterator(); i.hasNext(); )
      if (i.next().length() == 4)
        i.remove();
}