Java の String toLowerCase() メソッド

toLowerCase() メソッドとは何ですか?

メソッドヘッダー

public String toLowerCase()

メソッドの引数

戻り値の型

例1

public class ToLowerCase {
    public static void main(String[] args) {
        String myName = "Lubaina Khan";
        System.out.println("How do you spell your name? " + myName);
        // using toLowerCase() method
        System.out.println("May I have a lower case version? " + myName.toLowerCase());
    }
}

出力

例 2

public class ToLowerCase {

	public static void main(String[] args) {

		String date = java.util.Calendar.getInstance().getTime().toString();
		System.out.println("System Date : " + date);
		// using toLowerCase() method
		System.out.println("[lower case] : " + date.toLowerCase() + "\n");

		String paragraph = "This constantly evolving world still needs Java.";
		System.out.println("Original Paragraph: " + paragraph);
		// using toLowerCase() method
		System.out.println("[lower case] : " + paragraph.toLowerCase() + "\n");

		String punctuationPara = "Would you like to have some tea, Miss Peterson?";
		System.out.println("Punctuation Paragraph: " + punctuationPara);
		// using toLowerCase() method
		System.out.println("[lower case] : " + punctuationPara.toLowerCase() + "\n");
	}
}

出力

結論