Java String轉Integer Array用法及代碼示例

// Java Program to Convert String to Integer Array
// Using string.replaceAll() method
// Importing input output and utility classes
import java.io.*;
import java.util.Arrays;
public class GFG {
    public static void main(String[] args)
    {
        // declaring the string
        String str = "[1,2,356,678,3378]";
        // calling replaceAll() method and split() method on
        // string
        String[] string = str.replaceAll("\\[", "")
                              .replaceAll("]", "")
                              .split(",");
        // declaring an array with the size of string
        int[] arr = new int[string.length];
        // parsing the String argument as a signed decimal
        // integer object and storing that integer into the
        // array
        for (int i = 0; i < string.length; i++) {
            arr[i] = Integer.valueOf(string[i]);
        }
        // printing string
        System.out.print("String : " + str);
        // printing the Integer array
        System.out.print("\nInteger array : "
                         + Arrays.toString(arr));
    }
}

// Java Program to Convert String to Integer Array
// Using string.split() method
// Importing input output and utility classes
import java.io.*;
public class GFG {
    // Function for conversion
    static int[] method(String str)
    {
        String[] splitArray = str.split(" ");
        int[] array = new int[splitArray.length];
        // parsing the String argument as a signed decimal
        // integer object and storing that integer into the
        // array
        for (int i = 0; i < splitArray.length; i++) {
            array[i] = Integer.parseInt(splitArray[i]);
        }
        return array;
    }
    // main method
    public static void main(String[] args)
    {
        // Bufferedreader declaration
        BufferedReader br = new BufferedReader(
            new InputStreamReader(System.in));
        // string declaration
        String str = "1 23 456 7890";
        int i;
        // declaring the variable & calling the method with
        // passing string as an argument
        int[] array = method(str);
        // printing the string
        System.out.print("\nString : " + str);
        // printing the Integer array
        System.out.print("\nInteger array : [");
        for (i = 0; i < array.length; i++) {
            System.out.print(array[i] + " ");
        }
        System.out.print("]");
    }
}