How to avoid repetitive code intensive if statements in java

I am currently working on a text based RPG and am still learning java and programming in general. My question is this, I have come to a point in my program where the user will select their units and I dont know how to accomplish this without large if statements that are very restrictive in terms of expanding or altering the game play. How could I write something that could condense my if statements and have a more modular approve overall?

Here is what the user first see:

Welcome to RPG Game!

Please select 3 units!

Enter 1 to add a Ranger 100 4 10

Enter 2 to add a Heavy 100 4 15

enter 3 to add a Medic 100 4 10

To respond to this I have codded the following

if (resp == 1){
      if (rangerCount == 0){
      ArrayList<Item> rangerInv0 = new ArrayList<Item>();    
      Ranger rangerObj0 = new Ranger("Ranger", 100, 4, 10, rangerInv0);

      rangerObj0.pickUp(mh1000);
      rangerObj0.pickUp(s1000);
      rangerObj0.pickUp(t1000);

      rangerObj0.equip(mh1000);
      rangerObj0.equip(s1000);
      rangerObj0.equip(t1000);

      playerUnits.add(rangerObj0);
      playerUnitsCount++;
      rangerCount++;
      }
      else if (rangerCount == 1){
      ArrayList<Item> rangerInv1 = new ArrayList<Item>();    
      Ranger rangerObj1 = new Ranger("Ranger", 100, 4, 10, rangerInv1);

      rangerObj1.pickUp(mh1000);
      rangerObj1.pickUp(s1000);
      rangerObj1.pickUp(t1000);

      rangerObj1.equip(mh1000);
      rangerObj1.equip(s1000);
      rangerObj1.equip(t1000);

      playerUnits.add(rangerObj1);
      playerUnitsCount++;
      rangerCount++;
      }
      else if (rangerCount == 2){
      ArrayList<Item> rangerInv2 = new ArrayList<Item>();    
      Ranger rangerObj2 = new Ranger("Ranger", 100, 4, 10, rangerInv2);

      rangerObj2.pickUp(mh1000);
      rangerObj2.pickUp(s1000);
      rangerObj2.pickUp(t1000);

      rangerObj2.equip(mh1000);
      rangerObj2.equip(s1000);
      rangerObj2.equip(t1000);

      playerUnits.add(rangerObj2);
      playerUnitsCount++;
      rangerCount++;
      }
    } 
    else if (resp == 2) {
      if (heavyCount == 0) {
      ArrayList<Item> heavyInv0 = new ArrayList<Item>();    
      Heavy heavyObj0 = new Heavy("Heavy", 100, 4, 15, heavyInv0);

      heavyObj0.pickUp(mh4000);
      heavyObj0.pickUp(s1000);
      heavyObj0.pickUp(t1000);

      heavyObj0.equip(mh4000);
      heavyObj0.equip(s1000);
      heavyObj0.equip(t1000);

      playerUnits.add(heavyObj0);
      playerUnitsCount++;
      heavyCount++;
      }
      else if (heavyCount == 1){
      ArrayList<Item> heavyInv1 = new ArrayList<Item>();    
      Heavy heavyObj1 = new Heavy("Heavy", 100, 4, 15, heavyInv1);

      heavyObj1.pickUp(mh4000);
      heavyObj1.pickUp(s1000);
      heavyObj1.pickUp(t1000);

      heavyObj1.equip(mh4000);
      heavyObj1.equip(s1000);
      heavyObj1.equip(t1000);

      playerUnits.add(heavyObj1);
      playerUnitsCount++;
      heavyCount++;
      }
      else if (heavyCount == 2){
      ArrayList<Item> heavyInv2 = new ArrayList<Item>();    
      Heavy heavyObj2 = new Heavy("Heavy", 100, 4, 15, heavyInv2);

      heavyObj2.pickUp(mh4000);
      heavyObj2.pickUp(s1000);
      heavyObj2.pickUp(t1000);

      heavyObj2.equip(mh4000);
      heavyObj2.equip(s1000);
      heavyObj2.equip(t1000);

      playerUnits.add(heavyObj2);
      playerUnitsCount++;
      heavyCount++;
      }
    } 
    else if (resp == 3) {
      if (medicCount == 0) {
      ArrayList<Item> medicInv0 = new ArrayList<Item>();    
      Medic medicObj0 = new Medic("Medic", 100, 4, 10, medicInv0);

      medicObj0.pickUp(mh3000);
      medicObj0.pickUp(s1000);
      medicObj0.pickUp(t1000);

      medicObj0.equip(mh3000);
      medicObj0.equip(s1000);
      medicObj0.equip(t1000);

      playerUnits.add(medicObj0);
      playerUnitsCount++;
      medicCount++;
      }
      else if (medicCount == 1) {
      ArrayList<Item> medicInv1 = new ArrayList<Item>();    
      Medic medicObj1 = new Medic("Medic", 100, 4, 10, medicInv1);

      medicObj1.pickUp(mh3000);
      medicObj1.pickUp(s1000);
      medicObj1.pickUp(t1000);

      medicObj1.equip(mh3000);
      medicObj1.equip(s1000);
      medicObj1.equip(t1000);

      playerUnits.add(medicObj1);
      playerUnitsCount++;
      medicCount++;
      }
      else if (medicCount == 2) {
      ArrayList<Item> medicInv2 = new ArrayList<Item>();    
      Medic medicObj2 = new Medic("Medic", 100, 4, 10, medicInv2);

      medicObj2.pickUp(mh3000);
      medicObj2.pickUp(s1000);
      medicObj2.pickUp(t1000);

      medicObj2.equip(mh3000);
      medicObj2.equip(s1000);
      medicObj2.equip(t1000);

      playerUnits.add(medicObj2);
      playerUnitsCount++;
      medicCount++;
      }
    } 
    else {
      System.out.println("Please enter a valid responce!");
    }

The objects you see referenced in the multiple instances of pickUp() and equip() look like this for reference:

static Item mh1000 = new Item ("AR1", "Damage", 2, null, 0, null, 0, false, false);

to me this all seems very cumbersome. What if I want to make it a game with 5 units or 10 units, do I really have to add 2 to 7 lines of code per entry to accomplish this? it seems like there should be a much easier way to do this. Please advise.