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Java Collections - Collections.emptyList() Examples

Java Collections Java Java API

Class:

java.util.Collections

Method:

public static final <T> List<T> emptyList()

Returns an empty list (immutable).

Examples

package com.logicbig.example.collections;

import java.util.Collections;
import java.util.List;

public class EmptyListExample {

    public static void main(String... args) {
        List<String> list = Collections.emptyList();
        System.out.println(list);
    }
}

Output

[]

package com.logicbig.example.collections;

import java.util.Collections;
import java.util.List;

public class EmptyListExample2 {

    public static void main(String... args) {
        List<String> list = Collections.emptyList();
        list.add("a");
    }
}

Output

Caused by: java.lang.UnsupportedOperationException
	at java.base/java.util.AbstractList.add(AbstractList.java:153)
	at java.base/java.util.AbstractList.add(AbstractList.java:111)
	at com.logicbig.example.collections.EmptyListExample2.main(EmptyListExample2.java:15)
	... 6 more

See Also