Coordinate.java

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package chess;


public class Coordinate {
 private int row; // 0 is the bottom horizontal row
 private int column; // 0 is the left vertical column
 
 public Coordinate(int column, int row) throws IndexOutOfBoundsException
 {
 if ( (column<0)|| (column>7)) throw new IndexOutOfBoundsException("column must be between 0 and 7,inclusive");
 if ( (row<0)|| (row>7)) throw new IndexOutOfBoundsException("row must be between 0 and 7,inclusive");
 this.row = row;
 this.column = column; 
 }
 
 public Coordinate(char column, char row) throws IndexOutOfBoundsException
 {
 if ( (column<'a')|| (column>'h')) throw new IndexOutOfBoundsException("column must be between a and h,inclusive");
 if ( (row<'1')|| (row>'8')) throw new IndexOutOfBoundsException("row must be between 1 and 8,inclusive");
 this.column = column - 'a';
 this.row = row - '1'; 
 } 
 
 public Coordinate(String coordinate) throws IndexOutOfBoundsException
 {
 if (coordinate.length() != 2) throw new IllegalArgumentException ("Coordinate is a 2-character string");
 char column = coordinate.charAt(0);
 char row = coordinate.charAt(1);
 if ( (column<'a')|| (column>'h')) throw new IndexOutOfBoundsException("x must be between a and h, inclusive");
 if ( (row<'1')|| (row>'8')) throw new IndexOutOfBoundsException("y must be between 1 and 8, inclusive");
 this.column = column - 'a';
 this.row = row - '1'; 
 } 
 
 public int getColumnNumber() { return this.column; }
 public int getRowNumber() { return this.row; }
 
 public char getColumn() { return (char)(column + 'a'); }
 public char getRow() { return (char)(row+'0'+1); }
 
 @Override
 public String toString() { return "("+getColumnNumber()+","+getRowNumber()+")"; }
 public String name() { return "" + getColumn()+ getRow() ; }

}