List Test

Listest.java

import com.google.common.base.Function;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import lombok.Data;
import org.junit.Before;
import org.junit.Test;

import javax.annotation.Nullable;
import java.util.List;

public class ListTest {

    @Data
    private class TestDTO {
        private String a;

        public TestDTO(String a) {
            this.a = a;
        }
    }

    @Data
    private class TestToDTO {
        private String a;

        public TestToDTO(String a) {
            this.a = a;
        }
    }

    private List<TestDTO> testList = Lists.newArrayList();

    @Before
    public void init() {
        TestDTO t1 = new TestDTO("1");
        TestDTO t2 = new TestDTO("2");
        TestDTO t3 = new TestDTO("3");
        testList.add(t1);
        testList.add(t2);
        testList.add(t3);
    }

    @Test
    public void transform() {
        List<TestToDTO> transformed = Lists.transform(testList, new Function<TestDTO, TestToDTO>() {
            @Nullable
            @Override
            public TestToDTO apply(@Nullable TestDTO input) {
                TestToDTO testToDTO = new TestToDTO(input.getA());
                System.out.print("DDDDD");
                return testToDTO;
            }
        });

        for (TestToDTO t : transformed) {
            t.setA(t.getA() + "11");
        }

        for (TestToDTO t : transformed) {
            System.out.println(t.getA());
        }
        //1,2,3
    }

    @Test
    public void iterable() {
        List<TestToDTO> transformed = Lists.newArrayList(Iterables.transform(testList, new Function<TestDTO, TestToDTO>() {
            @Nullable
            @Override
            public TestToDTO apply(@Nullable TestDTO input) {
                TestToDTO testToDTO = new TestToDTO(input.getA());
                return testToDTO;
            }
        }));

        for (TestToDTO t : transformed) {
            t.setA(t.getA() + "11");
        }

        for (TestToDTO t : transformed) {
            System.out.println(t.getA());
        }
        //111,211,311
    }
}