public class IntField extends TextField
{
    public IntField();
    public IntField(int size);
    public void setInt(int number);
    public int getInt();
}
public class DoubleField extends TextField
{
    public DoubleField();
    public DoubleField(int size);
    public void setDouble(double num);
    public Double getDouble();
}

• Often need to repeat a calculation with minor changes
• Sometimes refine previous solution
• Somtimes calculates sucessive values in series
• Can do this under control of a button

while (boolean expression)

{

statement;

...

statement;

}



• statements repeated as long as logical expression is true
• For proper loop: at least one of previous statements must cause change in logical expression

• Summing the numbers 1 ... 100

• Gauss Story

• Code:

  int sum = 0;

  int k = 0;

  while (k < 100)

  {

  k = k + 1;

  sum = sum + k;

  }

• Count Down
• Starting and Stopping at Computed Values
• Data Dependent Loop

• Variable Size
• Other Shapes
• Use of Magic Numbers