我唯一的问题是在概述部分如何正确打印出拖车租赁名称？像这样：
但是我的概述代码并没有完全正常工作。问题是什么？ （我理解从零开始的数组计数）
import java.util.Scanner;
public class TrailerRental {
Scanner kb=new Scanner(System.in);
int weightSmall=750;
int weightLarge=3000;
int smallTrailerCounter =0;
int largeTrailerCounter =0;
String smallClientName;
String largeClientName;
String [] smallTrailersClients=new String[5];
String [] largeTrailersClients= new String[3];
public static void main(String[] args) {
new TrailerRental().run();
}
public void run(){
menu();
int menu=kb.nextInt();
while (menu==1 || menu==2|| menu==3){
if(menu==1){
smallTrailer();
}
if (menu==2){
largeTrailer();
}
if (menu==3){
overView();
}
}
if (menu==9){
System.out.println("Goodbye!");
}
else {
System.out.println("Error, incorrect input try again!");
System.out.println();
run();
}
}
public void overView() {
System.out.println("Overview");
System.out.println();
System.out.println("Rented Small trailers");
int notUsedSmallTrailer=5-smallTrailerCounter;
for (int i=0;i<smallTrailerCounter;i++){
System.out.println("Small trailer " +(i+1) + " :" +smallTrailersClients[i] );
}
System.out.println("There are "+notUsedSmallTrailer+ " out of 5 small trailers still available.");
System.out.println("Rented Large trailers");
int notUsedLargeTrailer=3-largeTrailerCounter;
for(int i=0;i<smallTrailerCounter;i++){
System.out.println("Large trailer " + (i+1) +" : "+largeTrailersClients[i] );
}
System.out.println("There are "+notUsedLargeTrailer+ " out of 3 large trailer still available ");
run();
}
public void largeTrailer() {
if (largeTrailerCounter>=3){
System.out.println("Unfortunately all Small trailers are out");
System.out.println("Would you like to rent a Small trailer instead?(y/n)");
String answer=kb.next();
if (answer.equals("y")){
smallTrailer();
}
if (answer.equals("n")){
run();
}
else {
System.out.println("Incorrect input, return to main menu");
run();
}
} else {
System.out.println("What is your name?");
largeClientName=kb.next();
System.out.println("Is the driver in possession of an E-type drivers license (y/n)?");
String answer=kb.next();
if (answer.equals("n")){
System.out.println("Unfortunately, a large trailer cannot be rented without a E-type drivers license. ");
run();
}
if (answer.equals("y")){
System.out.println("What is the weight of the load (in kg)?");
int weight=kb.nextInt();
if (weight<=weightLarge){
largeTrailerCounter++;
largeTrailersClients[largeTrailerCounter]=largeClientName;
run();
}
if (weight>weightLarge){
int difference=weight-weightLarge;
System.out.println("Warning! the maximum load "+weightLarge+" kg is exceeded by " +difference+ "kg" );
System.out.println("Are you sure you want to rent a trailer?(y/n)?");
String answer2=kb.next();
if (answer2.equals("n")){
run();
}
if (answer2.equals("y")){
largeTrailerCounter++;
largeTrailersClients[largeTrailerCounter]=largeClientName;
run();
}
else {
System.out.println("incorrect input,return to menu");
run();
}
}
}
}
}
public void smallTrailer() {
if (smallTrailerCounter>=5) {
System.out.println("Unfortunately all Small trailers are out");
run();
} else {
System.out.println("What is the customer last name?");
smallClientName = kb.next();
System.out.println("What is the weight of the load (in kg) ?");
int weight = kb.nextInt();
if (weight<=weightSmall){
smallTrailerCounter++;
smallTrailersClients[smallTrailerCounter]=smallClientName;
run();
}
if (weight > weightSmall) {
int difference = weight - weightSmall;
System.out.println("Warning the maximum load " + weightSmall + " kg is exceeded by " + difference + " kg!");
System.out.print("Are you sure you want to rent the small trailer? (y/n)");
String answer = kb.next();
if (answer.equals("n")) {
run();
}
if (answer.equals("y")) {
smallTrailerCounter++;
smallTrailersClients[smallTrailerCounter]=smallClientName;
run();
}
while (answer != "y" || answer != "n") {
System.out.print("Are you sure you want to rent the small trailer? (y/n)");
answer = kb.next();
if (answer.equals("n")) {
run();
}
if (answer.equals("y")) {
run();
}
}
}
}
}
public void menu() {
System.out.println("***********************");
System.out.println("* Trailer rental ");
System.out.println("***********************");
System.out.println("* 1) Rent small trailer");
System.out.println("* 2) Rent large trailer");
System.out.println("* 3) Overview ");
System.out.println("* 9) Exit ");
System.out.println("***********************");
System.out.print("Select an option:");
}
}
答案 0 :(得分：0)
您未向smallTrailersClients[i]或largeTrailersClients[i]添加1。您在for loop中引用了i + 1。引用正确的名称需要相同的名称。试试这个：
public void overView() {
System.out.println("Overview");
System.out.println();
System.out.println("Rented Small trailers");
int notUsedSmallTrailer=5-smallTrailerCounter;
for (int i=0;i<smallTrailerCounter;i++){
System.out.println("Small trailer " +(i+1) + " :" +smallTrailersClients[i+1] );
}
System.out.println("There are "+notUsedSmallTrailer+ " out of 5 small trailers still available.");
System.out.println("Rented Large trailers");
int notUsedLargeTrailer=3-largeTrailerCounter;
for(int i=0;i<smallTrailerCounter;i++){
System.out.println("Large trailer " + (i+1) +" : "+largeTrailersClients[i+1] );
}
System.out.println("There are "+notUsedLargeTrailer+ " out of 3 large trailer still available ");
run();
}