java put name before the variable name.
public class test
{
public static void main(String[] args)
{
Picture rocket = new Picture("mariner4.jpg");
rocket.translate(200, 200);
rocket.draw();
Picture planet = new Picture("mars.gif");
planet.grow(-50, -50);
planet.draw();
}
}
public class test
{
public static void main(String[] args)
{
Day birthday = new Day(1951, 5, 26);
Day lastDay = new Day(2012, 5, 26);
int daysAlive = lastDay.daysFrom(birthday);
System.out.println(daysAlive);
}
}
variable can vary and assignment has no type.
int numberOfPixels = object.methodname(arguments)
public class test
{
public static void main(String[] args)
{
Rectangle box = new Rectangle(60, 90, 20, 30);
Rectangle box2 = new Rectangle(80, 120, 20, 30);
box.draw();
box2.draw();
}
}
public class test
{
public static void main(String[] args)
{
String river = "Mississippi";
int numberOfLetters = river.length();
System.out.println(numberOfLetters);
}
}
replace method
public class test
{
public static void main(String[] args)
{
String river = "Mississippi";
String result = river.replaceAll("i","x");
System.out.println(result);
}
}
cut space with trim()
String messyString = "Hello, Space!";
messyString.trim()
AccessorとMutator:「Accessor=アクセスするヤツ」、「Mutator=mutate(訳すと変化させる)」
An accessor method is used to return the value of a private field.
A mutator method is used to set a value of a private field. It follows a naming scheme prefixing the word “set” to the start of the method name.
Implement test program, set actual result and expected result.