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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