StringsClient.java

package trial.yy.guava.client.base;

import com.google.common.base.Strings;

/**
 * com.google.common.base.Stringsを試すためのサンプル
 * User: yy
 */
public class StringsClient {

    public static void main(String[] args) {

        // 指定の文字列を指定回数繰り返す
        System.out.println("## Strings.repeat execute");
        System.out.println(Strings.repeat("a", 10));
        System.out.println(Strings.repeat("hello", 3));

        // 文字列の先頭を指定文字で埋める（left pad）
        System.out.println("## Strings.padStart execute");
        System.out.println(Strings.padStart("123", 5, '0'));
        System.out.println(Strings.padStart("abcde", 3, '*'));

        // 文字列の末尾を指定文字で埋める（right pad）
        System.out.println("## Strings.padEnd execute");
        System.out.println(Strings.padEnd("123.1", 7, '0'));
        System.out.println(Strings.padEnd("abcde", 3, '*'));

        // nullまたは空文字列（length == 0)かどうかをチェックする
        System.out.println("## Strings.isNullOrEmpty execute");
        System.out.println("null = " + Strings.isNullOrEmpty(null));
        System.out.println("empty string = " + Strings.isNullOrEmpty(""));
        System.out.println("hello = " + Strings.isNullOrEmpty("hello"));

        // nullの場合空文字列を返す
        System.out.println("## Strings.nullToEmpty execute");
        System.out.println("null -> [" + Strings.nullToEmpty(null) + "]");
        System.out.println("hello -> [" + Strings.nullToEmpty("hello") + "]");

        // 空文字列の場合nullを返す
        System.out.println("## Strings.nullToEmpty execute");
        System.out.println("empty string -> [" + Strings.emptyToNull("") + "]");
        System.out.println("hello -> [" + Strings.emptyToNull("hello") + "]");

        // 指定文字列同士の共通のprefixを返す
        System.out.println("## Strings.commonPrefix execute");
        System.out.println("foo_123456.txt & foo_234567.txt common prefix is [" + Strings.commonPrefix("foo_123456.txt", "foo_234567.txt") + "]");
        System.out.println("20130429 & 20130430 common prefix is [" + Strings.commonPrefix("20130429", "20130430") + "]");
        System.out.println("abc & def common prefix is [" + Strings.commonPrefix("abc", "def") + "]");

        // 指定文字列同士の共通のsuffixを返す
        System.out.println("## Strings.commonSuffix execute");
        System.out.println("foo_123456.txt & foo_234567.txt common suffix is [" + Strings.commonSuffix("foo_123456.txt", "foo_234567.txt") + "]");
        System.out.println("20130429 & 20120429 common suffix is [" + Strings.commonSuffix("20130429", "20120429") + "]");
        System.out.println("abc & def common suffix is [" + Strings.commonSuffix("abc", "def") + "]");
    }

}