public class Square { <instance variables> <constructors> <methods> }

publicclass Square { <instance variables> <constructors> <methods> }

public class Square { doublexCoord; doubleyCoord; Colorcolor; double length; …. }

public class Square { … publicSquare(double x, double y, doublelen, double c) { xCoord = x; yCoord = y; length = len; color = c; } … }

public class Square { … publicvoiddraw() { … } publicvoiderase() { … } publicvoidmove(doubledx, doubledy) { … } }

implementation hiding sq Square(x,y,len,color) draw() erase() move(dx, dy) API

private variables No one but you can touch your private parts

public class Square { privatedoublexCoord; privatedoubleyCoord; privateColor color; privatedouble length; …. }

getters getColor() getX() getY() getLength()

public class Square { … publicdoublegetX() { returnxCoord; } publicdoublegetY() { returnyCoord; } publicColorgetColor() { return color; } publicdoublegetLength() { returnlen; } }

setters setColor() setPos() setLength()

public class Square { … publicdoublesetPos(doublex, doubley) { xCoord = x; yCoord = y; } publicdoublesetColor(Colorc) { … } publicdoublesetLength(doublelen) { … } }

publicclass Circle { <instance variables> <constructors> <methods> }

public class Square { <instance variables> <constructors> <methods> }