java字符串String轉換爲char數組，String轉換爲List

String[]與List的相互轉換

1.0 String[]與List的相互轉換

String[] arr = new String[]{"s1","s2","s3"};
List<String> list = Arrays.asList(arr); 

1.2 List轉String[]

List<String> list = new ArrayList<String>();
list.add("s1");
list.add("s2");
list.add("s3");
String[] arr = list.toArray(new String[list.size()]);

字符數組char[]和字符串String之間的轉換

2.0 使用String.valueOf()將字符數組轉換成字符串

void (){
  char[] s={'A','G','C','T'};
  String st=String.valueOf(s);
  System.out.println("This is : "+st);
}

>> This is : AGCT

2.1使用.toCharArray()將字符串轉換成字符數組

String str="AGCT";
char[] s=str.toCharArray();
for (int i=0;i<str.length();i++){
      System.out.println("This s[i] "+i+s[i]);
}

This s[i] 0 A
This s[i] 1 G
This s[i] 2 C
This s[i] 3 T