Objective - NSString && java String 整理

1. 分開字符串變成數組並遍歷

//Objective-c
NSString *names = @"zhangxueyou,liuddehua,zhangmanyu,guofucheng";
NSArray *arr = [names componentsSeparatedByString:@","];
for(int i=0;i<[arr count];i++){
    NSLog(@"%@",[arr objectAtIndex:i]);
}

//java
String names = "zhangxueyou,liudehua,zhangmanyu,guofucheng";
String[] arr = names.split(",");
for(String s:arr){
    System.out.println(s);
}

2.判斷是否包含

//Objective-c
NSString *s = @"my name is liudehua.";
NSRange range = [s rangeOfString:@"liudehua"];
if(range.length>0){
  NSLog(@"this name contain liudehua.");
}

//java
String s = "this name is liudehua.";
if(s.contains("liudehua")){
    System.out.println("this name contain liudehua");
}

3.字符串比較

//Objective-c
NSString *s = @"my name is liudehua.";
if([s isEqualToString:@"my name is guofucheng."]){
   NSLog(@"same");
}

//java
String s = "my name is liudehua";
if(s.equals("my name is guofucheng")){
    System.out.println("same");
}

4.字符串拼接

//Objective-c
NSMutableString *ss = [NSMutableString stringWithCapacity:50];
for(int i=0;i<100;i++){
    if([ss length]>0){
        [ss appendString:@","];
    }
    [ss appendFormat:@"%d",i];
}
NSLog(@"%@",ss);

//java
StringBuffer ss = new StringBuffer("");
for(int i=0;i<100;i++){
    if(ss.length()>0){
        ss.append(",");
    }
    ss.append(i);
}
System.out.println(ss.toString());