javafor拼接字元串

㈠ java中如何解決sql字元串的拼接

String temp="";

for(String s : ids){
temp="("+s+"),"
}
temp=temp.subString(0,temp..lastIndexOf(","));

String sql="insert into info_cols(info_id) values "+s;

Conn.update(sql);
//這樣就與資料庫交互一次，資料庫交互盡量要少

㈡ java字元串的拼接

import java.util.Scanner;

public class dd {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in); //聲明輸入對象
System.out.println("請輸入第一個字元串:") ;//列印友好提示
String first = sc.next(); //阻塞，等待輸入第一個字元串
System.out.println("請輸入第一個字元串:"); //列印友好提示
String second = sc.next(); //阻塞，等待輸入第二個字元串
String s = first+second; //進行拼接
System.out.println("您輸入的字元串拼接後的結果為："+s); //列印拼接結果
}
}

純手打，求給分！絕對妥妥的！
這樣可以么？

㈢ java字元串拼接

可以不管有多少個key都先加上逗號，最後再刪除最後一個逗號。

importjava.util.HashMap;
importjava.util.Map.Entry;

publicclassTest{

	publicstaticvoidmain(String[]args){
		HashMap<Integer,Boolean>State=newHashMap<Integer,Boolean>();
		State.put(1,true);
		State.put(3,false);
		State.put(4,true);
		StringBuffersb=newStringBuffer();
		for(Entry<Integer,Boolean>entry:State.entrySet()){
			if(entry.getValue())
				sb.append(entry.getKey()).append(',');
		}
		sb.deleteCharAt(sb.length()-1);//刪除末尾的,
		System.out.println(sb);//輸出1,4
	}
}

㈣ java 拼接字元和解析字元串

importjava.util.ArrayList;
importjava.util.List;

/**
*CreatedbyAdministratoron2015/6/14.
*/
publicclassTest{
privatestaticList<String>infor;

static{
infor=newArrayList<String>();
infor.add("流水號1");
infor.add("收款方帳號1");
infor.add("真實姓名");
infor.add("付款金額1");
infor.add("備注說明1");
infor.add("流水號2");
infor.add("收款方帳號2");
infor.add("真實姓名");
infor.add("付款金額2");
infor.add("備注說明2");
}

publicstaticvoidmain(Stringargs[]){
/**
*開始拼接字元串
*/
StringinforString=infor.get(0);
for(inti=1,k=infor.size();i<k;i++){
if(i%5==0){
inforString+="|";
}else{
inforString+="^";
}
inforString+=infor.get(i);
}
System.out.println("拼接後的字元串是:"+inforString);


/**
*開始解釋字元串
*/
String[]usersInfor=inforString.split("\|");
System.out.println(usersInfor.length);

Useruser;
String[]userString;
for(inti=0,k=usersInfor.length;i<k;i++){
userString=usersInfor[i].split("\^");
user=newUser();
user.setId(userString[0]);
user.setGathering(userString[1]);
user.setName(userString[2]);
user.setPayment(userString[3]);
user.setRemark(userString[4]);
System.out.println("User"+i+"="+user);
}


}


staticclassUser{
privateStringid;
privateStringgathering;
privateStringname;
privateStringpayment;
privateStringremark;

publicUser(){

}

publicStringgetId(){
returnid;
}

publicvoidsetId(Stringid){
this.id=id;
}

publicStringgetGathering(){
returngathering;
}

publicvoidsetGathering(Stringgathering){
this.gathering=gathering;
}

publicStringgetName(){
returnname;
}

publicvoidsetName(Stringname){
this.name=name;
}

publicStringgetPayment(){
returnpayment;
}

publicvoidsetPayment(Stringpayment){
this.payment=payment;
}

publicStringgetRemark(){
returnremark;
}

publicvoidsetRemark(Stringremark){
this.remark=remark;
}

@Override
publicStringtoString(){
return"[id:"+id+",gathering:"+gathering+",name:"+name+",payment:"+payment+",remark:"+remark+"]";
}
}
}