如：
public class Oblong {
private double length;
private double width;
public double getLength() {
return length;
}
public void setLength(double length) {
this.length = length;
}
public double getWidth() {
return width;
}
public void setWidth(double width) {
this.width = width;
}
@Override
public String toString() {
return "該長方形的長為："+this.getLength()+"寬為："+this.getWidth(); //當然妳想要怎麽樣表述就寫什麽樣的描述。
}