java remove map
map.entrySet().removeIf(e -> <boolean expression>);java remove map
map.entrySet().removeIf(e -> <boolean expression>);spring delete mapping
package com.zetcode.controller;
import com.zetcode.model.Post;
import com.zetcode.service.IPostService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import java.util.Set;
import static org.springframework.http.ResponseEntity.ok;
@Controller
@RequestMapping("/posts")
public class MyController {
@Autowired
private IPostService postService;
@GetMapping
public ResponseEntity<Set<Post>> all() {
return ok().body(postService.all());
}
@DeleteMapping("{id}")
public ResponseEntity<Long> deletePost(@PathVariable("id") Long id) {
var isRemoved = postService.delete(id);
if (!isRemoved) {
return new ResponseEntity<>(HttpStatus.NOT_FOUND);
}
return new ResponseEntity<>(id, HttpStatus.OK);
}
}java remove map key
/*Suppose a map*/
Map<T> map = new HashMap<>();
/*Insert 2 keys, and remove one*/
map.put('First', 'John');
map.put('Second', 'Tommy');
// Returns a value, you don't have to save it if you want
String removedValue = map.remove('First');Removing Elements in java map
// Java program to demonstrate
// the working of Map interface
import java.util.*;
class Main {
public static void main(String args[])
{
// Initialization of a Map
// using Generics
Map<Integer, String> hashmap1= new HashMap<Integer, String>();
// Inserting the Elements
hashmap1.put(1, "Apple");
hashmap1.put(2, "Banana");
hashmap1.put(3, "Mango");
// Initial Map
System.out.println("Initial Map :"+hashmap1+"\n");
hashmap1.remove(new Integer(2));
// Final Map
System.out.println("Updated Map :"+hashmap1);
}
}Copyright © 2021 Codeinu
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