String s = "34经济";
chat c;
StringBuffer sb = new StringBuffer();
for( int i = 0; i < s.length(); i++ ){
if( c < '0' || c > '9' )
break;
sb.append(c);
}int num = Integer.parseInt( sb.toString() );
chat c;
StringBuffer sb = new StringBuffer();
for( int i = 0; i < s.length(); i++ ){
if( c < '0' || c > '9' )
break;
sb.append(c);
}int num = Integer.parseInt( sb.toString() );
int k=0;
for( int i = 0; i < s.length(); i++ ){
if(s.charAt(i)>'0' && s.charAt[i]<='9'){
k++;
}else{
break;
}
}int num = Integer.parseInt(s.substring(0,k));