java 入门测试代码(三)

字符串的处理：

这里使用的是: apache 库

1. 下载

2. 导入 commons-lang3-3.8.1.jar

3. import org.apache.commons.lang3.StringUtils;

4. 进行测试：

       // 字符串 相加
        String buu = StringUtils.join( "123", "-", "abc" );
        System.out.println( "join:" + buu );

        // join string
        String[] s22 = new String[]{"123","456"};//传入String类型的数组，使用"-"号拼接
        String join2 = StringUtils.join(s22,"-");
        System.out.println(join2);


        // split string
        String[] strs = StringUtils.split(join2, "-");

        for( String ss: strs )
           System.out.println( "split:" + ss );

        // left
        String strLeft = StringUtils.left( "123456", 3);
        System.out.println( "left:" + strLeft );

        // mid
        String strMid = StringUtils.mid( "123456", 2, 3 );
        System.out.println( "mid:" + strMid );

        // right
        String strRight = StringUtils.right("123456", 2);
        System.out.println( "right:" + strRight );

        // trim
        String trim = StringUtils.trim( " d fds " );
        System.out.println( "trim:" + trim );

        // replace
        String splace = StringUtils.replace( "abc123", "1", "aaa");
        System.out.println( "replace:" + splace );