幫忙找錯。感激不盡。 package cn.com.didizuchexitong; import java.util.Scanner; public class Test { public static void main(String[] args) { System.out.println("歡迎使用答答租車系統：您是否要租車：1.是 0.否"); Scanner input = new Scanner(System.in); int choice = input.nextInt(); while(true){ if(choice!=0 && choice!=1){ System.out.println("您輸入有誤，請重新輸入。"); }else{ break; } choice = input.nextInt(); } if(choice==1){ System.out.println("您可租車的類型及其價目表"); System.out.println("序號" + "\t" + "汽車名稱" + "\t\t" + "租金" + "\t\t" + "容量"); Vehicle[] v = {new Car("奧迪A4",500,4),new Car("馬自達6",400,4),new PickUp("皮卡雪6",450,4,2), new Car("金龍",800,20),new Truck("松花江",400,4),new Truck("依維柯",1000,20)}; for (int i = 0 ; i<v.length; i++) { System.out.print(i+1); v[i].dayIn(); } }else{ System.exit(0); } System.out.println("請輸入您要租車的數量："); int num = input.nextInt(); Vehicle[] v1 = new Vehicle[num]; for(int i = 0 ; i<num; i++){ System.out.println("請輸入第" + (i + 1) + "輛車的序號："); int number = input.nextInt(); v1[i] = v1[number-1]; } System.out.println("請輸入租車天數："); int day = input.nextInt(); System.out.println("您的賬單："); int sum = 0; int zairenshu = 0; int zaihuoshu = 0; for(int j = 0 ; j<v1.length; j++){ if(v1[j] instanceof Car){ Car c = (Car)v1[j]; sum = sum + c.getMoney()*day; zairenshu = zairenshu + c.getCarload(); }if(v1[j] instanceof Truck){ Truck t = (Truck)v1[j]; sum = sum + t.getMoney()*day; zaihuoshu = zaihuoshu + t.getFreight(); }if(v1[j] instanceof PickUp){ PickUp pu = (PickUp)v1[j]; sum = sum + pu.getMoney()*day; zairenshu = zairenshu + pu.getCarload(); zaihuoshu = zaihuoshu + pu.getFreight(); } } System.out.println("可載人的車："); for(int k = 0 ; k<v1.length; k++){ if(v1[k] instanceof Car || v1[k] instanceof PickUp){ System.out.println(v1[k].getName() +"\t"); } } System.out.println("總載人數：" + zairenshu + "人"); System.out.println("可載貨的車："); for(int n = 0 ; n<v1.length; n++){ if(v1[n] instanceof Truck || v1[n] instanceof PickUp){ System.out.println(v1[n].getName() +"\t"); } } System.out.println("總載貨數：" + zaihuoshu + "噸"); System.out.println("總租金為：" + sum + "元。"); } } import java.util.Scanner; public class Test { public static void main(String[] args) { System.out.println("歡迎使用答答租車系統：您是否要租車：1.是 0.否"); Scanner input = new Scanner(System.in); int choice = input.nextInt(); while(true){ if(choice!=0 && choice!=1){ System.out.println("您輸入有誤，請重新輸入。"); }else{ break; } choice = input.nextInt(); } if(choice==1){ System.out.println("您可租車的類型及其價目表"); System.out.println("序號" + "\t" + "汽車名稱" + "\t\t" + "租金" + "\t\t" + "容量"); Vehicle[] v = {new Car("奧迪A4",500,4),new Car("馬自達6",400,4),new PickUp("皮卡雪6",450,4,2), new Car("金龍",800,20),new Truck("松花江",400,4),new Truck("依維柯",1000,20)}; for (int i = 0 ; i<v.length; i++) { System.out.print(i+1); v[i].dayIn(); } }else{ System.exit(0); } System.out.println("請輸入您要租車的數量："); int num = input.nextInt(); Vehicle[] v1 = new Vehicle[num]; for(int i = 0 ; i<num; i++){ System.out.println("請輸入第" + (i + 1) + "輛車的序號："); int number = input.nextInt(); v1[i] = v1[number-1]; } System.out.println("請輸入租車天數："); int day = input.nextInt(); System.out.println("您的賬單："); int sum = 0; int zairenshu = 0; int zaihuoshu = 0; for(int j = 0 ; j<v1.length; j++){ if(v1[j] instanceof Car){ Car c = (Car)v1[j]; sum = sum + c.getMoney()*day; zairenshu = zairenshu + c.getCarload(); }if(v1[j] instanceof Truck){ Truck t = (Truck)v1[j]; sum = sum + t.getMoney()*day; zaihuoshu = zaihuoshu + t.getFreight(); }if(v1[j] instanceof PickUp){ PickUp pu = (PickUp)v1[j]; sum = sum + pu.getMoney()*day; zairenshu = zairenshu + pu.getCarload(); zaihuoshu = zaihuoshu + pu.getFreight(); } } System.out.println("可載人的車："); for(int k = 0 ; k<v1.length; k++){ if(v1[k] instanceof Car || v1[k] instanceof PickUp){ System.out.println(v1[k].getName() +"\t"); } } System.out.println("總載人數：" + zairenshu + "人"); System.out.println("可載貨的車："); for(int n = 0 ; n<v1.length; n++){ if(v1[n] instanceof Truck || v1[n] instanceof PickUp){ System.out.println(v1[n].getName() +"\t"); } } System.out.println("總載貨數：" + zaihuoshu + "噸"); System.out.println("總租金為：" + sum + "元。"); } }