資料結構
網路
關係資料庫管理系統 (RDBMS)
作業系統
Java
MS Excel
iOS
HTML
CSS
Android
Python
C語言程式設計
C++
C#
MongoDB
MySQL
Javascript
PHP
物理
化學
生物
數學
英語
經濟學
心理學
社會學
服裝設計
法律研究Java選單驅動程式檢查數字型別
在Java中，我們有用於表示數字的原始數值資料型別，例如short、byte、int、long、float和double。這些數值資料型別允許我們根據其範圍表示不同的整數和實數，因為特定資料型別具有其下限和上限。
以下是6種原始數值資料型別
byte: Range -128 to 127 (Size 1 byte) short: Range -32,768 to 32,767 (Size 2 bytes) int: Range -2,147,483,648 to 2,147,483,647 (Size 4 bytes) long: Range -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807 (8 bytes) float: Range 6 to 7 decimal digits for Fractional Numbers (Size 4 bytes) double: Range 15 decimal digits for Fractional Numbers (Size 8 bytes)
在本文中，我們將學習如何使用Java程式語言檢查數字的型別。我們將使用switch case實現該應用程式。
舉一些例子：
示例1
Suppose we have taken an integer type of value i.e. 222222 then it must show “number entered is a valid integer”.
示例2
Suppose we have taken a double type of value i.e 120.0 then it must show “number entered is a valid double”.
示例3
Suppose we have taken a float type of value i.e 2.1 then it must show “number entered is a valid float”.
示例4
Suppose we have taken a byte type of value i.e 23 then it must show “number entered is a valid byte”.
示例5
Suppose we have taken a short type of value i.e 32,765 then it must show “number entered is a valid short”.
示例6
Suppose we have taken a long type of value i.e 222222222222 then it must show “number entered is a valid long”.
語法
要檢查數字的型別，我們將檢查其資料型別。如果資料型別匹配，則結果為正，否則為負。要檢查它，我們有一個名為hasNextData_Type的函式。
以下是檢查“整數資料型別”的語法：
hasNextInt()
以下是檢查“雙精度資料型別”的語法：
hasNextDouble()
以下是檢查“浮點資料型別”的語法：
hasNextFloat()
以下是檢查“位元組資料型別”的語法：
hasNextByte()
以下是檢查“短整型資料型別”的語法：
hasNextShort()
以下是檢查“長整型資料型別”的語法：
hasNextLong()
演算法
步驟1 - 提示使用者輸入選擇。
步驟2 - 顯示選單。
步驟3 - 提示使用者輸入資料。
步驟4 - 使用switch case跳轉到選擇並執行操作。
步驟5 - 列印結果。
讓我們來看一下程式以便更好地理解。
示例
import java.util.*; public class Main{ public static void main(String args[]){ mainLoop: while (true) { Scanner sc = new Scanner( System.in ); System.out.println("\n***Menu***"); System.out.println("1. Check for Integer"); System.out.println("2. Check for Double"); System.out.println("3. Check for Float"); System.out.println("4. Check for Byte"); System.out.println("5. Check for Short"); System.out.println("6. Check for Long"); System.out.println("7. Terminate the program"); System.out.println("Enter action number (1-7): "); int command = sc.nextInt(); switch(command) { case 1: int input = 0; System.out.println("Enter an integer for its validation"); if(sc.hasNextInt()) { input = sc.nextInt(); System.out.println(input+" is a valid Integer"); } else{ System.out.println("It is not a valid Integer"); } break; case 2: double input1 = 0; System.out.println("Enter a Double for its validation"); if(sc.hasNextDouble()) { input1 = sc.nextDouble(); System.out.println(input1+" is a valid Double"); } else { System.out.println("It is not a valid Double"); } break; case 3: float input2; System.out.println("Enter a Float for its validation"); if(sc.hasNextFloat()) { input2 = sc.nextFloat(); System.out.println(input2+" is a valid Float"); } else{ System.out.println("It is not a valid Float"); } break; case 4: byte input3 = 0; System.out.println("Enter a Byte for its validation"); if(sc.hasNextByte()) { input3 = sc.nextByte(); System.out.println(input3+" is a valid Byte"); } else{ System.out.println("It is not a valid Byte"); } break; case 5: short input4 = 0; System.out.println("Enter a Short for its validation"); if(sc.hasNextShort()) { input4 = sc.nextShort(); System.out.println(input4+" is a valid Short"); } else{ System.out.println("It is not a valid Short"); } break; case 6: long input5 = 0; System.out.println("Enter a Short for its validation"); if(sc.hasNextLong()) { input5 = sc.nextLong(); System.out.println(input5+" is a valid Long"); } else{ System.out.println("It is not a valid Long"); } break; case 7: System.out.println("Program terminated"); break mainLoop; default: System.out.println("Wrong choice!!"); } } } }
輸出
***Menu*** 1. Check for Integer 2. Check for Double 3. Check for Float 4. Check for Byte 5. Check for Short 6. Check for Long 7. Terminate the program Enter action number (1-7): 1 Enter an integer for its validation 22222 22222 is a valid Integer ***Menu*** 1. Check for Integer 2. Check for Double 3. Check for Float 4. Check for Byte 5. Check for Short 6. Check for Long 7. Terminate the program Enter action number (1-7): 2 Enter a Double for its validation 2.4 2.4 is a valid Double ***Menu*** 1. Check for Integer 2. Check for Double 3. Check for Float 4. Check for Byte 5. Check for Short 6. Check for Long 7. Terminate the program Enter action number (1-7): 3 Enter a Float for its validation 2.5 2.5 is a valid Float ***Menu*** 1. Check for Integer 2. Check for Double 3. Check for Float 4. Check for Byte 5. Check for Short 6. Check for Long 7. Terminate the program Enter action number (1-7): 4 Enter a Byte for its validation 123 123 is a valid Byte ***Menu*** 1. Check for Integer 2. Check for Double 3. Check for Float 4. Check for Byte 5. Check for Short 6. Check for Long 7. Terminate the program Enter action number (1-7): 5 Enter a Short for its validation 1234 1234 is a valid Short ***Menu*** 1. Check for Integer 2. Check for Double 3. Check for Float 4. Check for Byte 5. Check for Short 6. Check for Long 7. Terminate the program Enter action number (1-7): 6 Enter a Short for its validation 345 345 is a valid Long ***Menu*** 1. Check for Integer 2. Check for Double 3. Check for Float 4. Check for Byte 5. Check for Short 6. Check for Long 7. Terminate the program Enter action number (1-7): 7 Program terminated
在本文中，我們探討了如何使用選單驅動方法在Java中檢查數字的型別。
更新於：2022年12月27日
417 次瀏覽
廣告