首頁猿問 java 字符串替換

java 字符串替換

JavaScript

www說 2019-04-13 08:46:01

Stringids1="4,1,2,3";Stringids2="1,2,3,4,9,10,12,14";Stringids3=？怎么把ids2前面四位替換成ids1那四位下面是我現(xiàn)在用的，有簡單的沒publicvoidtestStringSZ(){Stringids1="4,1,2,3";Stringids2="1,2,3,4,9,10,12,14";String[]ids1s=ids1.split(",");String[]ids2s=ids2.split(",");for(inti=0;i

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子衿沉夜

TA貢獻1828條經(jīng)驗獲得超3個贊

莫不是這個?看你的程序也沒有考慮trim(),也沒有考慮分隔符替換啥的@Testpublicvoidtest(){Stringids1="4,1,2,3";Stringids2="1,2,3,4,9,10,12,14,";System.out.println(ids1+ids2.substring(ids1.length()));//orSystem.out.println(ids2.replaceFirst("(\\d+,){3}\\d+",ids1));}如果是按ids1中數(shù)字個數(shù)來進行替換.首先計算數(shù)字個數(shù).如果ids2中沒有那么多數(shù)字,則不做替換.@Testpublicvoidtest(){Stringids1="4,1,2,3";Stringids2="1,2,3,4,9,10,12,14,";intcount=ids1.split(",").length;//orcountfor,first//intcount=ids1.length()-ids1.replace(",","").length()+1;System.out.println(ids2.replaceFirst("(\\d+,){"+(count-1)+"}\\d+",ids1));}

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隔江千里

TA貢獻1906條經(jīng)驗獲得超10個贊

可以用StringBuffer的replace函數(shù)啊。classreplace{publicstaticvoidmain(String[]args){Stringids1="4,1,2,3";Stringids2="1,2,3,4,9,10,12,14";//String[]ids1s=ids1.split(",");//String[]ids2s=ids2.split(",");//for(inti=0;i//ids2s[i]=ids1s[i];//}//StringBufferids3=newStringBuffer();//for(inti=0;i//if(i==0){//ids3.append(ids2s[i]);//}else{//ids3.append(","+ids2s[i]);//}//}//System.out.println(ids3.toString());StringBufferids4=newStringBuffer(ids2);ids4.replace(0,7,ids1);System.out.println(ids4.toString());}}