"if"文に複数のブール値condtionsを持つか？

Question

私は複数のブール条件で "if"文を書くことを試みています。今、5つの異なるブール変数があります。 "if"ステートメントでは、どのブール変数が真であるかによって異なるものを出力したいと思います。私が今持っているコードは、それぞれの "if"ステートメントからの結果を、真であるものからではなく、実際に出力します。

boolean result = Arrays.equals(user, Jamie); //compares the arrays 
boolean result2 = Arrays.equals(user, David); 
boolean result3 = Arrays.equals(user, Sally); 
boolean result4 = Arrays.equals(user, Susan); 
boolean result5 = Arrays.equals(user, Mary); 

if (result = true) { 
     Address a = new Address (20, 201107, "Pizza", "blue"); //makes the different objects 
     printLines (a); //calls the printLines method to print out the "Secret information" about the user 
} 
if (result2 = true) { 
     Address b = new Address (56, 211045, "Noodles", "Pink"); 
     printLines (b); 
} 
if (result3 = true) { 
     Address c = new Address (46, 329432, "Hamburgers", "Green"); 
     printLines (c); 
} 
if (result4 = true) { 
     Address d = new Address (80, 322810, "Fried Rice", "Yellow"); 
     printLines (d); 
} 
if (result5 = true) { 
     Address e = new Address (35, 405029, "Steak", "Red"); 
     printLines (e); 
} 
else { 
     System.out.println ("Password is wrong"); 
} 

基本的には、「結果」が真であるときに印刷オブジェクト「a」を印刷するだけです。ただし、 "result"がtrueの場合は、 "a"を印刷するのではなく、すべてのオブジェクト（a、b、c、d、e）を印刷します。どうすれば修正できますか？

Answer 1

使用else ifつだけの閉鎖がこれまでに評価されることを保証するために：あなたのコードとして

if (result) { 
    Address a = new Address (20, 201107, "Pizza", "blue"); //makes the different objects 
    printLines (a); //calls the printLines method to print out the "Secret information" about the user 
} 
else if (result2) { 
    Address b = new Address (56, 211045, "Noodles", "Pink"); 
    printLines (b); 
} 
else if (result3) { 
    Address c = new Address (46, 329432, "Hamburgers", "Green"); 
    printLines (c); 
} 
else if (result4) { 
    Address d = new Address (80, 322810, "Fried Rice", "Yellow"); 
    printLines (d); 
} 
else if (result5) { 
    Address e = new Address (35, 405029, "Steak", "Red"); 
    printLines (e); 
} 
else { 
    System.out.println ("Password is wrong"); 
} 

を複数の結果boolean型の変数が、その後mulitple ifブロックが評価される可能性がありますtrueた場合、現在、立っています。

Answer 2

使用

if (result) 

代わり

package com.johanw; 

public class StackOverFlow { 
    public static void main(String[] args) throws Exception{ 
     boolean value = false; 
     // the below condition is true, i.e. value == false 
     if (value == false) { 
      System.out.println("Value equals false"); 
     } 
     // the below condition is also true and this is what is the recommended approach for evaluating conditions 
     if (!value) { 
      System.out.println("Value equals false, i.e. !value is a true condition"); 
     } 
     // the below is another illustration of evaluating a condition, comparing the condition (1 == 1) with true 
     if ((1 == 1) == true) { 
      System.out.println("The condition 1 == 1 equals true"); 
     } 
     // the below condition is also true and also the recommended approach for evaluating a condition 
     if (1 == 1) { 
      System.out.println("The condition 1 == 1 equals true"); 
     } 
     // the below line is assigning a value true to the variable value and then evaluting the condition, which is true 
     if (value = true) { 
      System.out.println("Value was assigned the value true and therefore results in a true condition"); 
     } 
     // the below line is assigning a value false to the variable value and then evaluting the condition, which is false, and hence the else condition is valid 
     if (value = false) { 
     } else { 
      System.out.println("Value was assigned the value false and therefore results in a false condition"); 
     } 
    } 
}