java - 重复该程序，直到用户在数组中键入 none

Question

我试图重复运行我的代码，直到用户不输入任何内容。当我输入州名时，我需要它来制作州花和州鸟一次，而不会出现任何错误消息(再试一次)。但因为我写了行 for(int i=0; i<stateInfo.length; i++) ，它重复“重试”49 次，并在第 n 行给出答案，其中状态位于数组上。我需要通过仅打印州花和州鸟来使其工作。

//import Scanner, time.Duration, time.Instant
import java.util.Scanner;
import java.time.Duration;
import java.time.Instant;

public class StateFlowerBird {

/**
 * @param args the command line arguments
 */
public static void main(String[] args) {

    //Time counts starts
    Instant start = Instant.now();
    //greeting user
    greetings();

    //construct Scanner
    Scanner scannerIn = new Scanner(System.in);
    String state = "";

do {
    //2D Arrays with State, state flower, and state bird
    String[][] stateInfo = new String[][]{
    {"Alabama", "Camellia", "Yellowhammer"},
    {"Alaska", "Forget-me-not", "Willow Ptarmigan"},
    {"Arizona", "Saguaro cactus", "Cactus Wren"},
    {"Arkansas", "Apple blossom", "Mockingbird"},
    {"California", "Golden poppy", "California Valley Quail"},
    {"Colorado", "Rocky Mountain Columbine", "Lark Bunting"},
    {"Connecticut", "Mountain laurel", "Robin"},
    {"Delaware", "Peach blossom", "Blue Hen Chicken"},
    {"Florida", "Orange blossom", "Mockingbird"},
    {"Georgia", "Cherokee rose", "Brown Thrasher"},
    {"Hawaii", "Hibiscus", "Nene"},
    {"Idaho", "Syringa", "Mountain Bluebird"},
    {"Illinois", "Native violet", "Cardinal"},
    {"Indiana", "Peony", "Cardinal"},
    {"Iowa", "Wild rose", "Eastern Goldfinch"},
    {"Kansas", "Native sunflower", "Western Meadowlark"},
    {"Kentucky", "Goldenrod", "Cardinal"},
    {"Louisiana", "Magnolia", "Eastern Brown"},
    {"Maine", "Pine cone & tassle", "Chickadee"},
    {"Maryland", "Black Eyed Susan", "Baltimore Oriole"},
    {"Massachusettes", "Mayflower", "Chickadee"},
    {"Michigan", "Apple blossom", "Robin"},
    {"Minnesota", "Lady slipper", "Common Loon"},
    {"Mississippi", "Magnolia", "Mockingbird"},
    {"Missouri", "Hawthorn", "Bluebird"},
    {"Montana", "Bitterroot", "Western Meadowlark"},
    {"Nebraska", "Goldenrod", "Western Meadowlark"},
    {"Nevada", "Sagebrush", "Mountain Bluebird"},
    {"New Hampshire", "Purple lilac", "Purple Finch"},
    {"New Jersey", "Purple violet", "Eastern Goldfinch"},
    {"New Mexico", "yucca", "Roadrunner"},
    {"New York", "Rose", "Bluebird"},
    {"North Carolina", "Dogwood", "Cardinal"},
    {"North Dakota", "Wild prairie rose", "Western Meadowlark"},
    {"Ohio", "Scarlet carnation", "Cardinal"},
    {"Oklahoma", "Mistletoe", "Scissor-tailed"},
    {"Oregon", "Oregon Grape", "Western Meadowlark"},
    {"Pennsylvania", "Mountain laurel", "Ruffed Grouse"},
    {"Rhode Island", "Violet", "Rhode Island Red"},
    {"South Carolina", "Yellow jessamine", "Great Carolina Wren"},
    {"South Dakota", "Pasque flower", "Ring-necked Pheasant"},
    {"Tennesssee", "Purple iris", "Mockingbird"},
    {"Texas", "Texas Blue Bonnet", "Mockingbird"},
    {"Utah", "Sego lily", "American Seagull"},
    {"Vermont", "Red clover", "Hermit Thrush"},
    {"Virginia", "Dogwood", "Cardinal"},
    {"Washington", "Western rhododendron", "Willow Goldfinch"},
    {"West Virginia", "Rhododendron", "Cardinal"},
    {"Wisconsin", "Wood violet", "Robin"},
    {"Wyoming", "Indian paint brush", "Western Meadowlark"}}; 

    state = "";
    //Ask user to type the name of state or none
    System.out.println("\nEnter a State or None to exit: " + state);
    state = scannerIn.nextLine();

    for(int stateNum = 0;stateNum<stateInfo.length;stateNum++){
        if(stateInfo[stateNum][0].equalsIgnoreCase(state)){
            System.out.println("Flower: " +stateInfo[stateNum][1]
                    + "\nBird: " + stateInfo[stateNum][2]);
        }
        else if(!stateInfo[stateNum][0].equalsIgnoreCase(state)){
            errorMessage();
        }
    }

} while(!state.equalsIgnoreCase("None"));
    if (state.equalsIgnoreCase("None")){
        endStatement();
    }
    Instant end = Instant.now();
        System.out.println("Elapsed time in seconds was: " 
            + Duration.between(start, end).toNanos()/1_000_000_000.0 
            + " seconds.");
    System.out.println("**********************************");
    System.exit(0);
}


private static void greetings() {
        System.out.println("*****************************************************");
    System.out.println("***** Let's find out the state flower and bird! *****");
}
private static void endStatement() {
    System.out.println("\n***** Thank you for playing! *****");
}

private static void errorMessage() {
    System.out.println("Invalid State. Try it again.");
}
}

Answer 1

在 if 条件中使用“break”。一旦找到匹配，循环就会中断。