代码实现：
.pro
1 QT += core gui
2
3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
4
5 CONFIG += c++11
6
7 # The following define makes your compiler emit warnings if you use
8 # any Qt feature that has been marked deprecated (the exact warnings
9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
17
18 SOURCES += \
19 main.cpp \
20 mainwindow.cpp
21
22 HEADERS += \
23 mainwindow.h
24
25 FORMS += \
26 mainwindow.ui
27
28 # Default rules for deployment.
29 qnx: target.path = /tmp/$${TARGET}/bin
30 else: unix:!android: target.path = /opt/$${TARGET}/bin
31
View Code
main.cpp
1 #include "mainwindow.h"
2
3 #include <QApplication>
4
5 int main(int argc, char *argv[])
6 {
7 QApplication a(argc, argv);
8 MainWindow w;
9 w.show();
10 return a.exec();
11
View Code
mainwindow.h
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 #include <QMainWindow>
5 #include <QDebug>
6
7 QT_BEGIN_NAMESPACE
8 namespace Ui { class MainWindow; }
9 QT_END_NAMESPACE
10
11 class MainWindow : public QMainWindow
12 {
13 Q_OBJECT
14
15 public:
16 MainWindow(QWidget *parent = nullptr);
17 ~MainWindow();
18
19 private slots:
20 void on_pushButton_5_clicked();
21
22 void on_pushButton_4_clicked();
23
24 void on_pushButton_10_clicked();
25
26 void on_pushButton_3_clicked();
27
28 void on_pushButton_7_clicked();
29
30 void on_pushButton_6_clicked();
31
32 void on_pushButton_11_clicked();
33
34 void on_pushButton_12_clicked();
35
36 void on_pushButton_13_clicked();
37
38 void on_pushButton_14_clicked();
39
40 void on_pushButton_9_clicked();
41
42 void on_pushButton_8_clicked();
43
44 void on_pushButton_17_clicked();
45
46 void on_pushButton_18_clicked();
47
48 void on_pushButton_2_clicked();
49
50 void on_pushButton_clicked();
51
52 void on_pushButton_19_clicked();
53
54 void on_pushButton_20_clicked();
55
56 void on_pushButton_21_clicked();
57
58 void on_pushButton_16_clicked();
59
60 void on_pushButton_15_clicked();
61
62 void on_pushButton_22_clicked();
63
64 void on_pushButton_25_clicked();
65
66 void on_pushButton_24_clicked();
67
68 void on_pushButton_23_clicked();
69
70 private:
71 Ui::MainWindow *ui;
72 QMap<QString, int> m_pMap;
73 };
74 #endif // MAINWINDOW_H
View Code
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3
4 MainWindow::MainWindow(QWidget *parent)
5 : QMainWindow(parent)
6 , ui(new Ui::MainWindow)
7 {
8 ui->setupUi(this);
9
10 setWindowTitle(QStringLiteral("Qt之QMap的使用分析"));
11 }
12
13 MainWindow::~MainWindow()
14 {
15 delete ui;
16 }
17
18 void MainWindow::on_pushButton_5_clicked()
19 {
20 m_pMap.insert("key 2", 2);
21 m_pMap.insert("key 0", 0);
22 m_pMap.insert("key 1", 1);
23 }
24
25 void MainWindow::on_pushButton_4_clicked()
26 {
27 m_pMap["333"] = 333;
28 }
29
30 void MainWindow::on_pushButton_10_clicked()
31 {
32 m_pMap.insertMulti("three",4);
33 m_pMap.insertMulti("three",5);
34 m_pMap.insertMulti("three",6);
35 }
36
37 void MainWindow::on_pushButton_3_clicked()
38 {
39 if(!m_pMap.contains("333"))
40 ui->textEdit->append("contains:true");
41 else
42 ui->textEdit->append("contains:false");
43 }
44
45 void MainWindow::on_pushButton_7_clicked()
46 {
47 ui->textEdit->append("map[333]:" + QString::number(m_pMap["333"]));
48 }
49
50 void MainWindow::on_pushButton_6_clicked()
51 {
52 QList<QString> skeys = m_pMap.keys();
53 for(int i = 0; i< skeys.count(); i++)
54 {
55 ui->textEdit->append("skeys:" + skeys[i]);
56 }
57 }
58
59 void MainWindow::on_pushButton_11_clicked()
60 {
61 QList<QString> skeys2 = m_pMap.keys(4);
62 for(int i=0; i < skeys2.count(); i++)
63 {
64 ui->textEdit->append("skeys2:" + skeys2[i]);
65 }
66 }
67
68 void MainWindow::on_pushButton_12_clicked()
69 {
70 QList<int> svalues = m_pMap.values();
71 for(int i = 0; i < svalues.count(); i++)
72 {
73 ui->textEdit->append("svalues:" + QString::number(svalues[i]));
74 }
75 }
76
77 void MainWindow::on_pushButton_13_clicked()
78 {
79 QList<int> svalues2 = m_pMap.values("three");
80 for(int i=0; i<svalues2.count(); i++)
81 {
82 ui->textEdit->append("svalues2:" + QString::number(svalues2[i]));
83 }
84 }
85
86 void MainWindow::on_pushButton_14_clicked()
87 {
88 QMapIterator<QString, int> it(m_pMap);
89 while(it.hasNext())
90 {
91 it.next();
92 ui->textEdit->append("QMapIterator:" + it.key() + " : " + QString::number(it.value()));
93 }
94 }
95
96 void MainWindow::on_pushButton_9_clicked()
97 {
98 ui->textEdit->append("size:" + QString::number(m_pMap.size()));
99 }
100
101 void MainWindow::on_pushButton_8_clicked()
102 {
103 ui->textEdit->append("count:" + QString::number(m_pMap.count()));
104 }
105
106 void MainWindow::on_pushButton_17_clicked()
107 {
108 ui->textEdit->append("isEmpty:" + QString::number(m_pMap.isEmpty()));
109 }
110
111 void MainWindow::on_pushButton_18_clicked()
112 {
113 QMap<QString,int>::iterator it = m_pMap.find("333");
114 ui->textEdit->append("find 333:" + QString::number(it.value()));
115 }
116
117 void MainWindow::on_pushButton_2_clicked()
118 {
119 QList <QString> suniqueKeys = m_pMap.uniqueKeys();
120 for(int i = 0; i < suniqueKeys.count(); i++)
121 {
122 ui->textEdit->append("uniqueKeys:" + suniqueKeys[i]);
123 }
124 }
125
126 void MainWindow::on_pushButton_clicked()
127 {
128 int nfirst = m_pMap.first();
129 ui->textEdit->append("first:" + QString::number(nfirst));
130 }
131
132 void MainWindow::on_pushButton_19_clicked()
133 {
134 int nlast = m_pMap.last();
135 ui->textEdit->append("last:" + QString::number(nlast));
136 }
137
138 void MainWindow::on_pushButton_20_clicked()
139 {
140 QString firstKey = m_pMap.firstKey();
141 ui->textEdit->append("firstKey:" + firstKey);
142 }
143
144 void MainWindow::on_pushButton_21_clicked()
145 {
146 QString lastKey = m_pMap.lastKey();
147 ui->textEdit->append("lastKey:" + lastKey);
148 }
149 // 用Java风格迭代器进行遍历
150 void MainWindow::on_pushButton_16_clicked()
151 {
152 QMapIterator<QString,int> i(m_pMap);
153 i.toFront();
154 while(i.hasNext())
155 {
156 ui->textEdit->append("hasNext:" + i.key() + " : " + QString::number(i.next().value()));
157 }
158 i.toBack();
159 while(i.hasPrevious())
160 {
161 ui->textEdit->append("hasPrevious:" + i.key() + " : " + QString::number(i.previous().value()));
162 }
163
164 // bool jjj = i.findNext(2);
165 // if (jjj)
166 // qDebug() << "jjj: " << i.key() << i.value();
167
168 // bool kkk = i.findPrevious(2);
169 // if (kkk )
170 // qDebug() << "kkk : " << i.key() << i.value();
171 }
172 // 用STL风格迭代器进行遍历
173 void MainWindow::on_pushButton_15_clicked()
174 {
175 QMap<QString, int>::const_iterator constI;
176 for(constI = m_pMap.cbegin(); constI != m_pMap.cend(); constI++)
177 ui->textEdit->append("constI:" + constI.key() + " : " + QString::number(constI.value()));
178
179 QMap<QString,int>::iterator itI;
180 for(itI = m_pMap.begin();itI != m_pMap.end();itI++)
181 ui->textEdit->append("itI:" + itI.key() + " : " + QString::number(itI.value()));
182 }
183 // 用foreach进行遍历
184 void MainWindow::on_pushButton_22_clicked()
185 {
186 foreach(const QString &str, m_pMap.keys())
187 ui->textEdit->append("foreach: " + str + " : " + QString::number(m_pMap.value(str)));
188 // 对于多值映射，可以使用两重foreach语句
189 foreach(const QString &str, m_pMap.uniqueKeys())
190 {
191 foreach(int i, m_pMap.values(str))
192 ui->textEdit->append("uniqueKeys: " + str + " : " + QString::number(i));
193 }
194 }
195
196 void MainWindow::on_pushButton_25_clicked()
197 {
198 m_pMap.take("333");
199 ui->textEdit->append("take: " + QString::number(m_pMap.count()));
200 }
201
202 void MainWindow::on_pushButton_24_clicked()
203 {
204 m_pMap.remove("key 2");
205 ui->textEdit->append("remove: " + QString::number(m_pMap.count()));
206 }
207
208 void MainWindow::on_pushButton_23_clicked()
209 {
210 m_pMap.clear();
211 ui->textEdit->append("clear: " + QString::number(m_pMap.count()));
212
View Code
mainwindow.ui
1 <?xml version="1.0" encoding="UTF-8"?>
2 <ui version="4.0">
3 <class>MainWindow</class>
4 <widget class="QMainWindow" name="MainWindow">
5 <property name="geometry">
6 <rect>
7 <x>0</x>
8 <y>0</y>
9 <width>710</width>
10 <height>313</height>
11 </rect>
12 </property>
13 <property name="windowTitle">
14 <string>MainWindow</string>
15 </property>
16 <widget class="QWidget" name="centralwidget">
17 <layout class="QHBoxLayout" name="horizontalLayout">
18 <item>
19 <layout class="QVBoxLayout" name="verticalLayout">
20 <item>
21 <widget class="QTextEdit" name="textEdit"/>
22 </item>
23 <item>
24 <layout class="QHBoxLayout" name="horizontalLayout_4">
25 <item>
26 <widget class="QPushButton" name="pushButton_5">
27 <property name="text">
28 <string>增加元素方式1</string>
29 </property>
30 </widget>
31 </item>
32 <item>
33 <widget class="QPushButton" name="pushButton_4">
34 <property name="text">
35 <string>增加元素方式2</string>
36 </property>
37 </widget>
38 </item>
39 <item>
40 <widget class="QPushButton" name="pushButton_10">
41 <property name="text">
42 <string>增加元素方式3</string>
43 </property>
44 </widget>
45 </item>
46 </layout>
47 </item>
48 <item>
49 <layout class="QHBoxLayout" name="horizontalLayout_2">
50 <item>
51 <widget class="QPushButton" name="pushButton_3">
52 <property name="text">
53 <string>是否已经包含</string>
54 </property>
55 </widget>
56 </item>
57 <item>
58 <widget class="QPushButton" name="pushButton">
59 <property name="text">
60 <string>最小键对应的数据</string>
61 </property>
62 </widget>
63 </item>
64 <item>
65 <widget class="QPushButton" name="pushButton_19">
66 <property name="text">
67 <string>最大键对应的数据</string>
68 </property>
69 </widget>
70 </item>
71 <item>
72 <widget class="QPushButton" name="pushButton_20">
73 <property name="text">
74 <string>最小键</string>
75 </property>
76 </widget>
77 </item>
78 <item>
79 <widget class="QPushButton" name="pushButton_21">
80 <property name="text">
81 <string>最大键</string>
82 </property>
83 </widget>
84 </item>
85 </layout>
86 </item>
87 <item>
88 <layout class="QHBoxLayout" name="horizontalLayout_5">
89 <item>
90 <widget class="QPushButton" name="pushButton_7">
91 <property name="text">
92 <string>取值1</string>
93 </property>
94 </widget>
95 </item>
96 <item>
97 <widget class="QPushButton" name="pushButton_6">
98 <property name="text">
99 <string>取Keys</string>
100 </property>
101 </widget>
102 </item>
103 <item>
104 <widget class="QPushButton" name="pushButton_11">
105 <property name="text">
106 <string>取Keys2</string>
107 </property>
108 </widget>
109 </item>
110 <item>
111 <widget class="QPushButton" name="pushButton_12">
112 <property name="text">
113 <string>取values</string>
114 </property>
115 </widget>
116 </item>
117 <item>
118 <widget class="QPushButton" name="pushButton_13">
119 <property name="text">
120 <string>取values2</string>
121 </property>
122 </widget>
123 </item>
124 <item>
125 <widget class="QPushButton" name="pushButton_14">
126 <property name="text">
127 <string>QMapIterator</string>
128 </property>
129 </widget>
130 </item>
131 <item>
132 <widget class="QPushButton" name="pushButton_18">
133 <property name="text">
134 <string>查找find</string>
135 </property>
136 </widget>
137 </item>
138 <item>
139 <widget class="QPushButton" name="pushButton_2">
140 <property name="text">
141 <string>uniqueKeys</string>
142 </property>
143 </widget>
144 </item>
145 </layout>
146 </item>
147 <item>
148 <layout class="QHBoxLayout" name="horizontalLayout_6">
149 <item>
150 <widget class="QPushButton" name="pushButton_9">
151 <property name="text">
152 <string>总元素size</string>
153 </property>
154 </widget>
155 </item>
156 <item>
157 <widget class="QPushButton" name="pushButton_8">
158 <property name="text">
159 <string>总元素count</string>
160 </property>
161 </widget>
162 </item>
163 <item>
164 <widget class="QPushButton" name="pushButton_17">
165 <property name="text">
166 <string>判空isEmpty</string>
167 </property>
168 </widget>
169 </item>
170 </layout>
171 </item>
172 <item>
173 <layout class="QHBoxLayout" name="horizontalLayout_7">
174 <item>
175 <widget class="QPushButton" name="pushButton_16">
176 <property name="text">
177 <string>Java风格迭代器</string>
178 </property>
179 </widget>
180 </item>
181 <item>
182 <widget class="QPushButton" name="pushButton_15">
183 <property name="text">
184 <string>STL风格迭代器</string>
185 </property>
186 </widget>
187 </item>
188 <item>
189 <widget class="QPushButton" name="pushButton_22">
190 <property name="text">
191 <string>foreach</string>
192 </property>
193 </widget>
194 </item>
195 </layout>
196 </item>
197 <item>
198 <layout class="QHBoxLayout" name="horizontalLayout_8">
199 <item>
200 <widget class="QPushButton" name="pushButton_25">
201 <property name="text">
202 <string>取走take</string>
203 </property>
204 </widget>
205 </item>
206 <item>
207 <widget class="QPushButton" name="pushButton_24">
208 <property name="text">
209 <string>移除remove</string>
210 </property>
211 </widget>
212 </item>
213 <item>
214 <widget class="QPushButton" name="pushButton_23">
215 <property name="text">
216 <string>清空clear</string>
217 </property>
218 </widget>
219 </item>
220 </layout>
221 </item>
222 </layout>
223 </item>
224 </layout>
225 </widget>
226 </widget>
227 <resources/>
228 <connections/>
229
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