what is static setter and getter examples in java

1public class DataHolder
2{
3   private static String dataString;
4
5   public static String getDataString
6   {
7      return dataString;
8   }
9
10   public static void setString(String dataString)
11   {
12      this.dataString = dataString;
13   }
14}

1class SomeClass {
2    private static Data data;
3
4    public static void setData(String data) {
5        data = new Data(data);
6    }
7
8    public static String getData() {
9        return data.toString();
10    }
11}
12
13class Data {
14    private String data;
15
16    public Data(String data) {
17        this.data = data;
18    }
19
20    public String toString() {
21        return data;
22    }
23}

1public class DataHolder
2{
3   public static String dataString;
4}

1public class DataHolder{
2  private static String dataString;
3  public static String getDataString(){
4    synchronized(DataHolder.class){
5      return DataHolder.dataString;
6    }
7  }
8
9  public static void setString(String dataString){
10    synchronized(DataHolder.class){
11      DataHolder.dataString = dataString;
12    }
13  }
14}