1Z0-829 Working with Arrays and Collections — All Questions With Answers

Refer to the exhibit.

$ cat list.txt
A
B
C
D

$ cat ListDemo.java
import java.util.*;
import java.util.stream.*;
public class ListDemo {
    public static void main(String[] args) {
        List<String> list = new ArrayList<>(List.of("A", "B", "C", "D"));
        list.removeIf(s -> s.compareTo("C") > 0);
        System.out.println(list);
    }
}

$ javac ListDemo.java && java ListDemo

Refer to the exhibit.

Error log:
Exception in thread "main" java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.String
    at com.example.Cache.get(Cache.java:12)
    at com.example.Main.main(Main.java:10)

Source code:
public class Cache {
    private Map<String, Object> store = new HashMap<>();
    public <T> T get(String key, Class<T> type) {
        Object value = store.get(key);
        return type.cast(value);
    }
}

public class Main {
    public static void main(String[] args) {
        Cache cache = new Cache();
        cache.store.put("age", 30);
        String age = cache.get("age", String.class);
        System.out.println(age);
    }
}

Refer to the exhibit.
```
List<String> list = new ArrayList<>(List.of("A", "B", "C"));
for (String s : list) {
    if (s.equals("B")) {
        list.remove(s);
    }
}
System.out.println(list);
```

Refer to the exhibit.
List<String> list = new ArrayList<>(List.of("a","b","c"));
list.removeIf(s -> s.equals("b"));
System.out.println(list);

Refer to the exhibit.
List<String> list = new ArrayList<>();
list.add("A");
List<?> list2 = list;
list2.add("B");
System.out.println(list2);

Refer to the exhibit.
```java
import java.util.*;
import java.util.stream.*;
public class Test {
    public static void main(String[] args) {
        List<String> list = List.of("a", "b", "c");
        var result = list.stream()
                         .filter(s -> s.startsWith("b"))
                         .collect(Collectors.toUnmodifiableList());
        result.add("d");
        System.out.println(result);
    }
}
```