Java程式：將字串中每個單字的首字母大寫化

A string is a class of 'java.lang' package that stores a series of characters. Those characters are actually String-type objects. We must enclose the value of string within double quotes . Generally, we can represent characters in lowercase and uppercase in Java. And, it is also possible to convert lowercase characters into uppercase. This article aims to discuss a Java program to convert the first.

##Java program to Capitalize the first character of each word in a String

Before making a Java program to convert the first lowercase character of a string into uppercase, let's understand the problem statement first with the help of an example −

#實例

Input String#

Simply Easy Learning Tutorialspoint

Output string#

Simply Easy Learning Tutorialspoint

要將字串中每個單字的首字母大寫，Java提供了一個內建方法名為'toUpperCase()'，它接受一個小寫字元並傳回對應的大寫字元。

Example 1

的中文翻譯為：

範例 1

The following example demonstrates how we can capitalize the first character of each word in a string.

方法

• First, declare and initialize a String. Then, convert that string into a character array using an in-built method named 'toCharArray()'.

• 接下來，取一個for循環，它將運行到字元陣列的大小。

• 在這個for迴圈內部，定義一個if區塊來檢查字元陣列是否包含空格。如果編譯器遇到空格，則將下一個字元轉換為大寫並更新數組。

• 現在，我們需要將字元陣列轉換回字串。

• In the end, print the result and exit.

#

public class Capitalize {
   public static void main(String[] args) {
      String myinput = "simply easy learning tutorialspoint";
      // store each character to a char array
      char[] charAray = myinput.toCharArray();
      System.out.println("Before capitalizing: " + myinput);
      // for loop to capitalize first letter 
      for(int i = 0; i < charAray.length; i++) {
         // capitalizing first letter of first word
         charAray[0] = Character.toUpperCase(charAray[0]);
         // loop to check if there is space between two letters
         if(charAray[i] == ' ') {
            // capitalizing first letter of rest of the word
            charAray[i+1] = Character.toUpperCase(charAray[i+1]);
         }
      }
      // converting the character array to the string
      myinput = String.valueOf(charAray);
      // to print the final result
      System.out.println("After capitalizing the first letter: " + myinput);
   }
}

輸出

Before capitalizing: simply easy learning tutorialspoint
After capitalizing the first letter: Simply Easy Learning Tutorialspoint

Example 2

翻譯成中文為：

範例2

在下面的範例中，我們將使用使用者定義的方法來執行相同的任務和邏輯。

public class Capitalize {
   public static void Capital(String myinput) { // user-defined method
      // store each character to a char array
      char[] charAray = myinput.toCharArray();
      // for loop to capitalize first letter 
      for(int i = 0; i < charAray.length; i++) {
         // capitalizing first letter of first word
         charAray[0] = Character.toUpperCase(charAray[0]);
         // loop to check if there is space between two letters
         if(charAray[i] == ' ') {
            // capitalizing first letter of rest of the word
            charAray[i+1] = Character.toUpperCase(charAray[i+1]);
         }
      }
      // converting the character array to the string
      myinput = String.valueOf(charAray);
      // to print the final result
      System.out.println("After capitalizing the first letter: " + myinput); 
   }
   public static void main(String[] args) {
      String myinput = "simply easy learning tutorialspoint";
      System.out.println("Before capitalizing: " + myinput);
      Capital(myinput); // calling the method to capitalize
   }
}

輸出

Before capitalizing: simply easy learning tutorialspoint
After capitalizing the first letter: Simply Easy Learning Tutorialspoint

結論

在本文中，我們討論了兩種方法來將字串中每個單字的首字母大寫。但是，這兩種方法共同的一點是內建方法 'toUpperCase()'，它將小寫字元轉換為大寫字元。

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