replaceAll()
中,必须用\\\\
表达一个\
,因为Java中\
是转义字符,通常会误以为\\
就能表示\
实际上,replaceAll()
底层运用了正则表达式,经历了两次转化,即replaceAll("\\\\")
转化出\\
提交给正则表达式,正则表达式再转化一次获得\
,同理,用8个反斜杠表示\\
. replaceAll ( "\\\\" , "\\\\\\\\" )
String s = "\u0000" ;
System . out. println ( "li" + s + "song" ) ;
System . out. println ( new Gson ( ) . toJson ( "li" + s + "song" ) ) ;
string和byte[]的转换open in new window
String str = "Hello" ;
byte [ ] srtbyte = str. getBytes ( ) ;
String res = new String ( srtbyte) ;
String s = "段1:00:00:00-12:12:12" ;
String [ ] split = s. split ( ":" , 2 ) ;
for ( String one : split) {
System . out. println ( one) ;
}
List < Ooxx > list = List . of (
new Ooxx ( 1 , "张三" ) ,
new Ooxx ( 2 , "李四" ) ,
new Ooxx ( 3 , "王五" ) ) ;
StringBuilder sb = new StringBuilder ( ) ;
for ( Ooxx one : list) {
sb. append ( one. getName ( ) ) . append ( "," ) ;
}
sb. deleteCharAt ( sb. length ( ) - 1 ) ;
System . out. println ( "sb = " + sb) ;
List < Ooxx > list = List . of (
new Ooxx ( 1 , "张三" ) ,
new Ooxx ( 2 , "李四" ) ,
new Ooxx ( 3 , "王五" ) ) ;
String collect = list. stream ( )
. map ( Ooxx :: getName )
. collect ( Collectors . joining ( "," ) ) ;
System . out. println ( "collect = " + collect) ;
hasEmpty()
只判断是否为null
或""
hasBlank()
则会把" "
也算做空boolean hasBlank = StrUtil . hasBlank ( "li" , "song" , "tao" , "" ) ;
String concat = StrUtil . concat ( true , "one|" , "two|" , "three|" , "fore" ) ;
String template = "{}爱{},就像老鼠爱大米" ;
String str = StrUtil . format ( template, "我" , "你" ) ;
String s = "<img src=http://listao.cn:10000/i/0/2024/04/08/084409-0.webp />" ;
List < String > split = StrUtil . split ( s, StrUtil . SLASH ) ;
System . out. println ( split) ;
String join = StrUtil . join ( "\\" , split) ;
System . out. println ( join) ;
String s = "<img src=http://listao.cn:10000/i/0/2024/04/08/084409-0.webp alt=image-20200704111417472 alt=FileWriter />" ;
String sub = StrUtil . sub ( s, 0 , 7 ) ;
System . out. println ( sub) ;
String s = "<img src=http://listao.cn:10000/i/0/2024/04/08/084409-0.webp alt=image-20200704111417472 alt=FileWriter />" ;
String subAfter = StrUtil . subAfter ( s, "alt=" , true ) ;
System . out. println ( subAfter) ;
String s = "<img src=http://listao.cn:10000/i/0/2024/04/08/084409-0.webp alt=image-20200704111417472 alt=FileWriter />" ;
String subBefore = StrUtil . subBefore ( s, "alt=" , false ) ;
System . out. println ( subBefore) ;