public class Area{???

public static void main(String args[])
??? {
??????? double a1,a2,b1,b2;//假定a1、a2為長、b1、b2為寬
??????? double i;//i為Δ
??????? double perimeter=4.39;
??????? double area=0.57;
??????? i = (perimeter*perimeter)-4*area;
??????? if(i >= 0)
??????? {
??????????? a1 = ((-perimeter) + Math.sqrt(i)) / ( 2 * area );
??????????? a2 = ((-perimeter) - Math.sqrt(i)) / ( 2 * area );??????
??????????? b1 = area / a1;
??????????? b2 = area / a2;
??????????? System.out.println("第一種情況：長為"+a1+"? "+"寬為"+b1);
??????????? System.out.println("第二種情況：長為"+a2+"? "+"寬為"+b2);
??????? }
??????? else System.out.println("長、寬均不存在");
??? }

}