class java.lang.Object

• boolean equals(Object other)
  
• String toString()
  

class java.lang.Integer

• Integer(int value)
• int intValue()

class java.lang.Double

• Double(double value)
• double doubleValue()
  

class java.lang.String

• int length()
• String substring(int from, int to) // returns the substring beginning at from // and ending at to-1
• String substring(int from) // returns substring(from, length())
• int indexOf(String str) // returns the index of the first occurrence of str; // returns -1 if not found
• int compareTo(String other) // returns a value < 0 if this is less than other // returns a value = 0 if this is equal to other // returns a value > 0 if this is greater than other
  

class java.lang.Math

• static int abs(int x)
• static double abs(double x)
• static double pow(double base, double exponent)
• static double sqrt(double x)
• static double random() // returns a double in the range [0.0, 1.0)
  

class java.util.ArrayList<E>

• int size()
• boolean add(E obj) // appends obj to end of list; returns true
• void add(int index, E obj) // inserts obj at position index (0, // moving elements at position index and higher // to the right (adds 1 to their indices) and adjusts size size)££index
• E get(int index)
• E set(int index, E obj) // replaces the element at position index with obj
  // returns the element formerly at the specified position
• E remove(int index) // removes element from position index, moving elements // at position index + 1 and higher to the left // (subtracts 1 from their indices) and adjusts size // returns the element formerly at the specified position