mindol1004/spring-boot-rest
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

BAEL-1983 Intialize a HashMap in Java (#4819)

Browse Source
This commit is contained in:
Dhrubajyoti Bhattacharjee
2018-07-29 00:14:05 +05:30
committed by maibin
parent 33889d0cd7
commit 7ff4d2ea4c
3 changed files with 140 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

33
core-java-9/src/main/java/com/baeldung/java9/maps/initialize/MapsInitializer.java Normal file
View File

@@ -0,0 +1,33 @@
package com.baeldung.java9.maps.initialize;
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Map;
public class MapsInitializer {
@SuppressWarnings("unused")
public void createMapWithMapOf() {
Map<String, String> emptyMap = Map.of();
Map<String, String> singletonMap = Map.of("key1", "value");
Map<String, String> map = Map.of("key1","value1", "key2", "value2");
}
public void createMapWithMapEntries() {
Map<String, String> map = Map.ofEntries(
new AbstractMap.SimpleEntry<String, String>("name", "John"),
new AbstractMap.SimpleEntry<String, String>("city", "budapest"),
new AbstractMap.SimpleEntry<String, String>("zip", "000000"),
new AbstractMap.SimpleEntry<String, String>("home", "1231231231")
);
}
@SuppressWarnings("unused")
public void createMutableMaps() {
Map<String, String> map = new HashMap<String, String> (Map.of("key1","value1", "key2", "value2"));
Map<String, String> map2 = new HashMap<String, String> ( Map.ofEntries(
new AbstractMap.SimpleEntry<String, String>("name", "John"),
new AbstractMap.SimpleEntry<String, String>("city", "budapest")));
}
}