1. Verbal test: a) What's the difference between StringBuffer and StringBuilder b) What's the diff between a linkedList and arrayList? When would you use each? 2. Language Quiz -Strings a="hello"; b="hello"; c=new String("hello"); d=c; e=new String("hello"); Tell me the result a) a==b b)a.equals(b) c)a==c d)c==d e)c.equals d f) c==e g)c.equals e 3. Code time!!! program a method that returns an inOrder Arraylist of the nodes in a tree public ArrayList inOrder(Node root);

Question

1. Verbal test:
a) What's the difference between StringBuffer and StringBuilder
b) What's the diff between a linkedList and arrayList? When would you use each?
2. Language Quiz -Strings
a="hello"; b="hello"; c=new String("hello"); d=c; e=new String("hello");
Tell me the result
a) a==b
b)a.equals(b)
c)a==c
d)c==d
e)c.equals d
f) c==e
g)c.equals e

3. Code time!!!
program a method that returns an inOrder Arraylist of the nodes in a tree
public ArrayList<Integer> inOrder(Node root);

Utilisateur anonyme · Accepted Answer

1a) One is synchronized and the other one is not. Hence one is quicker than the other due to this fact.
1b) You should know this one. 

2. a-true, string literals always equal, try it.
b-true
c-false
d-true
e-true
f-false
g-true

3.
public ArrayList InOrder(Node root){
ArrayListresult=new ArrayList();
if(root=!=null){
result.addAll(InOrder(root.left()));
result.add(root.value());
result.addAll(InOrder(root.right()));
}
return result;
}

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