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  scu09156146  commented on May 2, 2024, 10:26 p.m. ← edited →

  題解

  import java.util.Scanner;
  
  class Triangle {
      private double sideA, sideB, sideC;
  
      public Triangle() {
      }
  
      public void setEdge(double s1, double s2, double s3) {
          // 設定三邊長
          sideA = s1;
          sideB = s2;
          sideC = s3;
      }
  
      public String isTriangle() {
          // 若「兩短邊和」大於「最長邊」，符合三角形邊長條件
          // 先用if-else判斷「最長邊」為何
          if (sideA >= sideB && sideA >= sideC) {
              return (sideB + sideC > sideA) ? "true" : "false";
          } else if (sideB >= sideA && sideB >= sideC) {
              return (sideA + sideC > sideB) ? "true" : "false";
          } else if (sideC >= sideB && sideC >= sideA) {
              return (sideB + sideA > sideC) ? "true" : "false";
          } else {
              return "false";
          }
      }
  
      public void ShowDetail() {
          // 印出訊息
          System.out.print(sideA + " " + sideB + " " + sideC + " " + this.isTriangle());
          // 用this.isTriangle()呼叫class的方法(Method)
      }
  }
  
  public class IsTriangle {
  
      public static void main(String[] args) {
          // TODO Auto-generated method stub
          Scanner input = new Scanner(System.in);
          Triangle triangle = new Triangle(); // 建立Triangle物件
          // 設定物件的三個邊長
          triangle.setEdge(input.nextDouble(), input.nextDouble(), input.nextDouble()); 
          input.close();
          triangle.ShowDetail(); // 顯示訊息
      }
  
  }