String
?或?CharSequence
?实例有关的静态实用程序方法。
官方文档:Strings (Guava: Google Core Libraries for Java 27.0.1-jre API)
方法名称 | 方法说明 |
---|---|
commonPrefix(CharSequence a, CharSequence b) ? | 返回共同的前缀字符串. |
commonSuffix(CharSequence a, CharSequence b) ? | 返回共同的后缀字符串. |
emptyToNull(@Nullable String string) ? | 返回字符串非空字符串,返回原字符串。否则,返回null. |
isNullOrEmpty(@Nullable String string) ? | 判断字符串是不是null或者空字符串. |
lenientFormat(@Nullable String template, Object... args) ? | 返回给定的模板字符串,每次出现的“%s”都替换为args中对应的参数值; 或者,如果占位符和参数计数不匹配,则返回该字符串形式. |
nullToEmpty(@Nullable String string) ? | 返回字符串非null,返回原字符串。否则返回空字符串. |
padEnd(String string, int minLength, char padChar) ? | 返回字符串,长度最少是minLength,长度不够的话用重复的padChar填充. |
padStart(String string, int minLength, char padChar) ? | 返回字符串,长度最少是minLength,长度不够的话用重复的padChar填充. |
repeat(String string, int count) ? | 返回string重复count次. |
import com.google.common.base.Strings;
import org.junit.Test;
/**
* Strings 字符串处理
*/
public class StringsTest {
@Test
public void strings() {
//1.判空
System.out.println(Strings.isNullOrEmpty("")); // true
System.out.println(Strings.isNullOrEmpty(null)); // true
System.out.println(Strings.isNullOrEmpty("hello")); // false
//2.将null转化为""
System.out.println(Strings.nullToEmpty(null)); // ""
//3.追加字符
// 从尾部不断补充T只到总共8个字符,如果源字符串已经达到或操作,则原样返回。类似的有padStart
System.out.println(Strings.padEnd("hello", 8, 'T')); // helloTTT
//4.统计出现次数
//返回string重复count次.
System.out.println(Strings.repeat("hello", 3)); //hellohellohello
//5.模板填充
//返回给定的模板字符串,每次出现的“%s”都替换为args中对应的参数值; 或者,如果占位符和参数计数不匹配,则返回该字符串形式.
String[] args = {"a", "b", "c"};
System.out.println(Strings.lenientFormat("hi,%s,hello,%s,jack,%s", args));//hi,a,hello,b,jack,c
String[] longArgs = {"a", "b", "c", "b"};
System.out.println(Strings.lenientFormat("hi,%s,hello,%s,jack,%s", longArgs));//hi,a,hello,b,jack,c [b]
String[] shortArgs = {"a", "b"};
System.out.println(Strings.lenientFormat("hi,%s,hello,%s,jack,%s", shortArgs));//hi,a,hello,b,jack,%s
//6.找寻相同前/后缀
System.out.println(Strings.commonPrefix("Hello", "Het")); // He
System.out.println(Strings.commonPrefix("Hello", "Hit")); // H
System.out.println(Strings.commonPrefix("Hello", "hit")); // 空
System.out.println(Strings.commonPrefix("Hello", "Xit")); // 空
System.out.println(Strings.commonSuffix("world", "xid")); // d
System.out.println(Strings.commonSuffix("world", "xic")); // 空
}
}
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