Notes

2.arraylist brojevi 0 za kraj:
import java.util.ArrayList;
import java.util.Scanner;
class HelloWorld {
public static void main(String[] args) {
ArrayList<Double>brojevi=new ArrayList<>();
Scanner scanner=new Scanner(System.in);
System.out.println("Unesite decimalne brojeve(unos 0 za kraj):");
while(true){
double broj=scanner.nextDouble();
if(broj==0){
break;
}
brojevi.add(broj);
}
double suma=0;
for(double br:brojevi){
suma+=br;
}
System.out.println("Suma unesenih brojeva : " +suma);
}
}

3. broj bodova ucenika i ispis
import java.util.HashMap;
import java.util.Scanner;
class HelloWorld {
public static void main(String[] args) {
HashMap<String, Integer>uceniciOcjene=new HashMap<>();
Scanner scanner=new Scanner(System.in);
System.out.println("Unesite ime ucenika i broj bodova(unos 'kraj' za kraj):");
while (true){
String ime=scanner.next();
if(ime.equals("kraj")){
break;
}
int ocjene=scanner.nextInt();
uceniciOcjene.put(ime, ocjene);
}
System.out.println("Unesite ime ucenika za ispis bodova");
String unosImena=scanner.next();
if(uceniciOcjene.containsKey(unosImena)){
System.out.println("Broj bodova za " + unosImena + " je:" +uceniciOcjene.get(unosImena));
}else{
System.out.println("Nema podataka o bodovima za " +unosImena);
}
scanner.close();
}
}

4. imena ucenika ispisivanje imena
import java.util.LinkedList;
import java.util.Scanner;
class HelloWorld {
public static void main(String[] args) {
LinkedList<Integer>grades=new LinkedList<>();
Scanner scanner=new Scanner(System.in);
System.out.println("Unesite ocjene (napisite -1 za kraj");
int grade;
while((grade =scanner.nextInt()) !=-1){
grades.add(grade);
}
System.out.println("Sve ocjene");
for(int gradeValue:grades){
System.out.println(gradeValue);
}
double sum=0;
for(int gradeValue:grades){
sum+=gradeValue;
}
double average=sum/grades.size();
System.out.println("Prosjek ocjene " +average);
scanner.close();
}
}

1.