java在多个字符串之间添加符号 用java如何将一个字符串中的一些字符逐个写入另一个字符串？
JAVA\u4e2d\u600e\u4e48\u5411\u4e00\u4e2a\u5b57\u7b26\u4e32\u7684\u56fa\u5b9a\u4f4d\u7f6e\u63d2\u5165\u5b57\u7b26\u4e32String\u56fa\u5b9a\u4f4d\u7f6e\u63d2\u5165\u5b57\u7b26\u4e32\uff0c\u5b9e\u73b0\u65b9\u6cd5\u6bd4\u8f83\u591a\uff0c\u6bd4\u5982\u6570\u7ec4\u7b49\u65b9\u6cd5
\u4e0b\u9762\u4e3e\u4f8b\u8bf4\u660e
StringBuilder \u662f\u53ef\u53d8\u7684\u5b57\u7b26\u4e32
public class StrDemo {
public static void main(String[] args) {
String str1 = "\u6211java";
StringBuilder sb = new StringBuilder(str1);//\u6784\u9020\u4e00\u4e2aStringBuilder\u5bf9\u8c61
sb.insert(1, "\u6b63\u5728\u5b66\u4e60");//\u5728\u6307\u5b9a\u7684\u4f4d\u7f6e1\uff0c\u63d2\u5165\u6307\u5b9a\u7684\u5b57\u7b26\u4e32
str1 = sb.toString();
System.out.println(str1);
}
}
\u8f93\u51fa
\u6211\u6b63\u5728\u5b66\u4e60java
StringBuilder \u5728\u5927\u91cf\u5b57\u7b26\u4e32\u64cd\u4f5c\u7684\u60c5\u51b5\u4e0b\uff0c\u6548\u7387\u660e\u663e\u6bd4\u5b57\u7b26\u4e32\u7528\u52a0\u53f7\uff08+\uff09\u8fde\u63a5\uff0c\u5feb\u5f88\u591a\u3002
\u76f4\u63a5\u8c03\u7528string.charAt(index)\u65b9\u6cd5\u5faa\u73af\u5c31\u53ef\u4ee5\u4e86
public class Test {
public static void main(String[] args) {
String firstStr = "abcdefg12345";
String secondStr = getEachCharInTheStr(firstStr);
System.out.println(secondStr);
}
private static String getEachCharInTheStr(String str) {
StringBuffer sb = new StringBuffer();
for(int i = 0, len = str.length(); i < len; i++){
sb.append(str.charAt(i));
}
return sb.toString();
}
}
-------------
abcdefg12345
String [] strArray = {s1,s2,s3,s4};
String newStr = "";
for(int i=0; i<strArray.length; i++){
// 先判断是否为null 再判断是否为空字符串，比较字符串要用equals
if(strArray[i]!=null && !strArray.equals("") ){
newStr += strArray[i] ;
if(i<strArray.length-1){//去掉最后一个@@
newStr += "@@";
}
}
}
System.out.println(newStr);
String [] strArry = {s1,s2,s3,s4};
String newStr = "";
for(int i=0; i<strArry.length; i++){
if(strArry[i]!="" ){
newStr += strArry[i] ;
if(i<strArry.length-1){//去掉最后一个@@
newStr += "@@";
}
}
}
System.out.println(newStr);
楼上代码有点小问题，我稍微改了一下。
String [] strArray = {s1,s2,s3,s4};
String newStr = "";
for(int i=0; i<strArray.length; i++){
// 先判断是否为null 再判断是否为空字符串，比较字符串要用equals
if(strArray[i]!=null && !strArray.equals("") ){
newStr += strArray[i] ;
if(i<strArray.length-1){//去掉最后一个@@
newStr += "@@";
}
}
}
System.out.println(newStr);
直接根据需要添加即可：
String [] oldstr= {a,b,c,d};
String newstr = "";
for(int i=0; i<oldstr.length; i++){
if(oldstr[i]!="" ){
newstr += str[i] ;
if(i<oldstr.length-1){//去掉最后一个&&
newstr+= "&&";
}
}
}
System.out.println(newStr);
绛旓細String [] strArray = {s1,s2,s3,s4};String newStr = "";for(int i=0; i<strArray.length; i++){ // 鍏堝垽鏂槸鍚︿负null 鍐嶅垽鏂槸鍚︿负绌瀛楃涓锛屾瘮杈冨瓧绗︿覆瑕佺敤equals if(strArray[i]!=null && !strArray.equals("") ){ newStr += strArray[i] ;if(i<strArray.length-1){/...
绛旓細鐩存帴鎶瀛楃涓閮芥帴鏀讹紝鐒跺悗鎶婂瓧绗︿覆鐢╯plit绌烘牸鍘诲垎鍓层
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绛旓細public class Test { public static void main(String[] args){ String s="12345543211234554321";StringBuffer s1=new StringBuffer(s);int index;for(index=5;index
绛旓細public class YuGiOh{public static void main ( String[] args ){String input = "abcdefghijk";String regex = "(.{2})";input = input.replaceAll (regex, "$1 ");System.out.println (input);}}
绛旓細// a涓哄師瀛楃涓锛宐涓鸿鎻掑叆鐨勫瓧绗︿覆锛宼涓烘彃鍏ヤ綅缃 public String Stringinsert(String a,String b,int t){ return a.substring(0,t)+b+a.substring(t+1,a.length());} 濡傛灉鎻掑叆鐨勬槸瀛楃 public String Stringinsert(String a,char b,int t){ return a.substring(0,t)+b+a.substring(...
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绛旓細public static void main(String args[]){ System.out.println(new Test().fiveChar(new Test().original));} public String fiveChar(String input){ char[] charArray=input.toCharArray();String temp="";for(int i=0;i<charArray.length;i++){ temp+=charArray[i];if(i!=(charArray....
绛旓細`20` 浼氳鑷姩杞崲涓哄瓧绗︿覆绫诲瀷銆傞渶瑕佹敞鎰忕殑鏄紝鍦 Java 涓紝浣跨敤 `+` 杩愮畻绗﹁繛鎺ュ瓧绗︿覆鏃讹紝浼氬垱寤轰竴涓柊鐨勫瓧绗︿覆瀵硅薄锛屽洜姝ら绻佸湴浣跨敤 `+` 杩愮畻绗﹀彲鑳戒細瀵艰嚧鍐呭瓨鍗犵敤澧炲姞鍜屾ц兘涓嬮檷銆傚鏋滈渶瑕鍦ㄥ涓瓧绗︿覆涔嬮棿杩涜澶ч噺杩炴帴鎿嶄綔锛屽彲浠ヨ冭檻浣跨敤 `StringBuilder` 鎴 `StringBuffer` 绫绘潵鎻愰珮鏁堢巼銆
绛旓細java瀛楃涓涓湪鐗瑰畾浣嶇疆鎻掑叆鍙︿竴涓瓧绗︿覆鍙互閲囩敤StringBuffer鎴栬匰tringBuilder浣滀负涓粙瀹屾垚銆傚洜涓篠tringBuffer鎴栬匰tringBuilder涓惈鏈夋彃鍏ュ瓧绗︿覆鐨勬柟娉昳nsert(int offset, String str);鍙傛暟offset琛ㄧず鎻掑叆鐨勪綅缃紝str琛ㄧず闇瑕佹彃鍏ョ殑瀛楃涓诧紝璇ユ柟娉曡繑鍥炲间究鏄彃鍏ュ畬鎴愮殑StringBuffer鐨勫璞°備笅闈㈡垜鎻愪緵涓涓緥瀛,浠ｇ爜...
