Question

statesBag is type BagInterface<String>. What is printed when the following statements are run?

System.out.println(statesBag.isEmpty());
statesBag.add("alaska");
statesBag.add("california");
statesBag.add("delaware");
statesBag.add("california");
statesBag.add("georgia");
statesBag.add("delaware");
statesBag.add("washington");
statesBag.add("delaware");
statesBag.add("iowa");
System.out.println(statesBag.isEmpty());
System.out.println(statesBag.getCurrentSize());
System.out.println(statesBag.remove("california"));
System.out.println(statesBag.contains("hawaii"));
System.out.println(statesBag.getCurrentSize());
System.out.println(statesBag.remove("washington"));
System.out.println(statesBag.remove("new york"));
System.out.println(statesBag.getCurrentSize());
System.out.println(statesBag.remove("california"));
System.out.println(statesBag.remove("california"));
System.out.println(statesBag.getCurrentSize());
System.out.println(statesBag.getFrequencyOf("delaware"));
System.out.println(statesBag.getFrequencyOf("hawaii"));
statesBag.clear();
System.out.println(statesBag.getCurrentSize());
System.out.println(statesBag.isEmpty());

Answer 1

System.out.println(statesBag.isEmpty()); // true as it has no data
       statesBag.add("alaska");
       statesBag.add("california");
       statesBag.add("delaware");
       statesBag.add("california");
       statesBag.add("georgia");
       statesBag.add("delaware");
       statesBag.add("washington");
       statesBag.add("delaware");
       statesBag.add("iowa");
       System.out.println(statesBag.isEmpty()); // false as it has data
       System.out.println(statesBag.size()); // 9 as we added 9 cities
       System.out.println(statesBag.remove("california")); // true as california is removed
       System.out.println(statesBag.contains("hawaii")); // true as it has hawaii
       System.out.println(statesBag.size()); // 8 as we removed california
       System.out.println(statesBag.remove("washington")); // true as it will remove washington
       System.out.println(statesBag.remove("new york")); // false as it does not has new york
       System.out.println(statesBag.size()); // 7 as we removed washington
       System.out.println(statesBag.remove("california")); // true as we have 2 california
       System.out.println(statesBag.remove("california")); // false we already removed california
       System.out.println(statesBag.size()); // now it is 6
       System.out.println(statesBag.getFrequencyOf("delaware")); //2 as we have 2
       System.out.println(statesBag.getFrequencyOf("hawaii")); // 0 as we already removed hawaii
       statesBag.clear(); // removes all data
       System.out.println(statesBag.size()); // 0
       System.out.println(statesBag.isEmpty()); // true as we clreared