|
|
, H7 S/ l+ B$ g& ?《4种循环遍历Map的方法总结》java基础3 ^# @- J* J7 u# v# g4 k
Map是我们编程中比较常用的集合，开发中经常会遍历map中的key与value，无眠之夜通过4中方式实现map的遍历，大家仅供参考。' T* q3 U" p6 ^7 n
{1 J9 a6 D0 z1 e
; d0 G& g. w0 Y; o5 i' _package com.javazx.test.collect;+ X, ~& v5 u% o, y) ]% L
/ s4 t. ~7 _$ }- P3 Aimport java.util.HashMap;
1 C* C5 [3 A5 {import java.util.Iterator;6 u( [% y- R) }4 L' w
import java.util.Map;% y. }: T- Z. X' b* j2 v8 |
import java.util.Set;) i3 L6 p. q! g2 F" h
3 k g6 B3 L, p7 S* v9 h/**
* y4 o( j u8 ^- v * @author: itmrchen7 C5 m& j5 @ ^
* @Description:. q1 } K# Q6 `
* @date 2019/2/14 1:477 T( j( F0 O( w2 a- @7 g' J
*/( d3 c' R: I6 `/ B: o1 ^8 j
public class MapT {
; b8 b) M$ J! |. ~0 _8 \ public static void main(String[] args) {& Q4 ]* X5 c, J
Map<Integer, String> map = new HashMap();5 M& p' ?& a# q/ E
map.put(1, "111");
9 I+ z$ i1 j$ T8 e6 |% j map.put(2, "222");
4 b" a- C n6 U3 D$ _( W1 s" W Set<Integer> set = map.keySet();1 S) Y; Z. A* u" R2 p
for (Integer t : set) {1 O7 L% q' ^" r) m2 F6 `4 U2 N
System.out.println(t + ":" + map.get(t));% ~, E6 x& k9 p- M6 s) G) x# T
}9 e) w6 o P2 ]) J" |
* O* f( g$ B0 F5 _- M
for (String s : map.values()) {8 D& m. }5 |0 R |
System.out.println(s);
T, M7 Z! s1 \. Z7 e0 `5 d6 S% D6 \ }
: ?0 {' D, ^! u' e
8 o2 V; R) M; o( B% Y for (Map.Entry<Integer, String> entry : map.entrySet()) {
- A1 P: u1 R, e$ f. \( w' `8 N2 [ System.out.println(entry.getKey() + ":" + entry.getValue());
! e$ K. _% I$ g' S* E }# f( Y" I! l; n. T0 I! R, F' c3 ]* I
/ m1 H; W3 Z- j1 F
Iterator<Map.Entry<Integer, String>> iterator = map.entrySet().iterator();
- L* x5 D& c+ K while (iterator.hasNext()) {
4 J" e9 O, ^1 n# q Map.Entry<Integer, String> ma = iterator.next();, B" L3 t# |! b: `, x9 G
System.out.println(ma.getKey() + " :" + ma.getValue());, ^& e( w. o+ f. Q) l+ y: ]# v
}' G1 n3 g, R. @9 p9 ~
}
! Q" ` `0 ?+ {, R) B! i, `$ W}
* y/ S! X6 J) d* h1 U" h7 Y
( c* I# P% m( e$ Q |
|
[复制链接]
发表于 2019-2-14 02:04:34
发表于 2019-12-24 16:11:52
