问使2D数组成为属性，JAVA

EN

package battleship;

public class Sea {

//declare properties
private int width;
private int lenght;
private String[][] field = new String[getLenght()][getWidth()];

public int getWidth() {
    return width;
}
public int getLenght() {
    return lenght;
} 
public String[][] getField() {
    return field;
}


//create constructor
public Sea(int width, int length){
    this.width = width;
    this.lenght = length;
    field =  new String[length][width];
}

//creates a method that visualizes the field with the ships
String[][] toStringWithShips(){
    for(int col = 0; col < this.getLenght(); col++){
        for(int row = 0; row < this.getWidth(); row++){
            field[col][row] = ".";
        }
    }
    return field;
}
}