Java Boolean toString() 方法

2025 年 3 月 20 日 | 阅读 2 分钟

Java Boolean 类的 toString() 方法返回此 Boolean 的字符串表示形式。

如果定义的布尔值为 true，则返回“true”；否则返回 false。

语法

public String toString()
public static String toString(boolean b)  

参数

不适用

b - 这是要转换的 Boolean 参数。

返回值

toString() 方法返回

此 Boolean 值的字符串表示形式。
定义的布尔值的字符串表示形式。

示例 1

示例

public class Main {
    public static void main(String[] args) {
        Boolean b1 = true;
        System.out.println("Boolean value = "+b1);
        System.out.println("Hash Code for boolean value = "+b1.hashCode());
        //converting boolean value tp String
        String str = b1.toString();
        System.out.println("String value = "+str);
        System.out.println("Hash Code for String Value = "+str.hashCode());

    }
}

编译并运行

输出

Boolean value = true
Hash Code for boolean value = 1231
String value = true
Hash Code for String Value = 3569038

示例 2

import java.util.Scanner;

  public class BooleanToStringExample2 {
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);
            System.out.println("Enter your percentage.");
            Double d1 = scanner.nextDouble();
            Boolean b1 = false;
            if (d1 > 64) {
                b1 =true;}
                String str = b1.toString();
                if((str=="true")) {
                    System.out.println("Congratulation! You have passed.");
                }
                else {//if(str=="false')
                double d2=64.0-d1;
                System.out.println("Sorry! You have failed. You needed "+d2+" more marks to pass .\nTry again next year.");
            }
        }
    }

输出

Enter your percentage.
89
Congratulation! You have passed.

示例 3

示例

public class Main {
   static Boolean b1 = true;
    int age;
  static void getAge(int age){
     // calling static toString Method()
       while (Boolean.toString(b1)=="true"){
           System.out.println("Your age is "+age +" years.");
           b1 = true;
           String str = Boolean.toString(b1);
           if(age>17){
               System.out.println("You eligible to enter the club.");
           }
           else{
               int val = 18-age;
               System.out.println("Sorry! You are not an adult.\nYou will be eligible after"+val+"year.");
           }
          b1 =false;
       }
   }
    public static void main(String[] args) {
        getAge(9);

    }
}

编译并运行

输出

Your age is 9 years.
Sorry! You are not an adult.
You will be eligible after9year.

示例 4

import java.util.Scanner;

public class BooleanToStringExample4 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        try {
            System.out.println("True/False:-\n5 months have 30 days. ");
            System.out.print("Ans: ");
            Boolean b1 = scanner.nextBoolean();
            //calling static tpString() method
            if (Boolean.toString(b1) == "false") {
                System.out.println("Answer is right.\nBecause all 11 months(except feb) have 30 days. ");
            } else {
                System.out.println("Answer is wrong.\nBecause all 11 months (except Feb) have 30 days.");
            }
        }catch (Exception e){
            System.out.println("Plz enter a valid answer. Either true or False.");

        }
    }
}

输出

True/False:-
5 months have 30 days. 
Ans: true
Answer is wrong.
Because all 11 months (except Feb) have 30 days.

示例 5

示例

public class Main {
    public static void main(String[] args) {
        boolean b1 = true;
        System.out.println("boolean value = "+b1);
        String str =b1.toString();
        System.out.println("String value = "+str);
    }
}

编译并运行

输出

Error:(7, 23) java: boolean cannot be dereferenced

Boolean 是基本数据类型，不能使用其对象调用 Boolean 类对象。

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Java Boolean toString() 方法

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Java Boolean toString() 方法

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