我很快就搞定了。您现在可以
StringUtils.center(String s, int size)在中使用
String.format。
import static org.hamcrest.CoreMatchers.*;import static org.junit.Assert.assertThat;import org.junit.Test;public class TestCenter { @Test public void centersString() { assertThat(StringUtils.center(null, 0), equalTo(null)); assertThat(StringUtils.center("foo", 3), is("foo")); assertThat(StringUtils.center("foo", -1), is("foo")); assertThat(StringUtils.center("moon", 10), is(" moon ")); assertThat(StringUtils.center("phone", 14, '*'), is("****phone*****")); assertThat(StringUtils.center("India", 6, '-'), is("India-")); assertThat(StringUtils.center("Eclipse IDE", 21, '*'), is("*****Eclipse IDE*****")); } @Test public void worksWithFormat() { String format = "|%1$-10s|%2$-10s|%3$-20s|n"; assertThat(String.format(format, StringUtils.center("FirstName", 10), StringUtils.center("Init.", 10), StringUtils.center("LastName", 20)), is("|FirstName | Init. | LastName |n")); }}class StringUtils { public static String center(String s, int size) { return center(s, size, ' '); } public static String center(String s, int size, char pad) { if (s == null || size <= s.length()) return s; StringBuilder sb = new StringBuilder(size); for (int i = 0; i < (size - s.length()) / 2; i++) { sb.append(pad); } sb.append(s); while (sb.length() < size) { sb.append(pad); } return sb.toString(); }}
