java合併char string

to concate two string, just use [+] operator. try following code:

public class StrAdd
{ public static void main( String[] args )
{ String str1 = new String( "a" );
String str2 = new String( "*" );
String str3 = str1 + str2;

System.out.println( str3 );
}
}


if u want to get double for this string, just use [+=]. try following code:

public class StrDouble
{ public static void main( String[] args )
{ String str1 = new String( "*" );

str1 += str1;

System.out.println( str1 );
}
}

hope can help u