Lesson 2 Work

Learnings

• Static Initialization Blocks are mainly used to initialize static fields of a class.
• Objects are instances within a class
• Methods: certain set of code that runs a specific task
• Non static methods are dot operators
• Void methods don't return values, hence void
• Strings are created with String class constructor
• Wrapper class: integer and double class are part of java.lang

Concatenation

• Combines strings together
• Must be string to string

String a = "I like";
String b = " turtles";
System.out.println(a + b + " a lot!");

I like turtles a lot!

Math Class

• Can do mathematical operations such as square root and power
• Random num generator

int a = 100;
int b = 23;
// Absolute value
Math.abs(a/b);

4

Comparing numbers/strings/objects

• Can check if numbers are equal using "==" or "!="
• .equals() used for strings

int a = 4;
int b = 4;
int c = 5;

// same
System.out.println(a == b);

// dif
System.out.println(a == c);

// does not equal
System.out.println(a != b);

String j = new String("wow");
String l = new String("wow");
String k = new String("not wow");

// Comparing strings
System.out.println(j == l);
System.out.println(j == k);

// Using .equals()
System.out.println(j.equals(l));

true
false
false
false
false
true

// FRQ 1a

public int scoreGuess(String guess)
{
    int count = 0;
    for (int i = 0; i <= secret.length() - guess.length(); i++)
    {
        if (secret.substring(i, i + guess.length()).equals(guess))
        {
            count++;
        }
    }
    return count * guess.length();
}

// FRQ 1b

public String findBetterGuess(String guess1, String guess2)
{
    if (scoreGuess(guess1) > scoreGuess(guess2))
    {
        return guess1;
    }
    if (scoreGuess(guess2) > scoreGuess(guess1))
    {
        return guess2;
    }
    if (guess1.compareTo(guess2) > 0)
    {
        return guess1;
    }
    return guess2;
}