import java.util.HashMap;
import java.util.Hashtable;
import java.util.TreeSet;
class Class {
public Class() {
}
public static void main(String[] args) {
HashMap map = new HashMap();
System.out.print(map.put("1","A") + ",");
System.out.print(map.put("2","B") + ",");
System.out.print(map.put("3","C") + ",");
System.out.print(map.put("1",null));
}
}
Compilar e rodar o codigo
a. null,null,null,null
b. null,null,null,A
c. A,B,C,null
d. true,true,true,false
e. true,true,true,true
f. Compile error
g. Runtime error
