conversion.java

package demo;

import java.util.Arrays;
import java.util.Collection;
import java.util.List;

import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.support.DefaultConversionService;

@SpringBootApplication
public class DemoApplication implements CommandLineRunner {

	public static void main(String[] args) {
		SpringApplication.run(DemoApplication.class, args);
	}

	@Override
	public void run(String... strings) throws Exception {
		Collection<String> source = Arrays.asList("1", "2", "3");
		ConversionService conversionService = new DefaultConversionService();
		Object target = conversionService.convert(source, TypeDescriptor.forObject(source),
				TypeDescriptor.collection(List.class, TypeDescriptor.valueOf(Integer.class)));
		System.out.println(target);

	}
}