list forEach示例
public class HelloWorld {
public static void main(String[] args) {
List<User> list = new ArrayList<>();
for(int i=1;i<=10;i++) {
list.add(new User(i, "user_" + i));
}
//list forEach
list.forEach(user -> {
user.setId(user.getId() + 10);
System.out.println(user);
});
}
private static class User{
public User(Integer id, String name) {
this.id = id;
this.name = name;
}
Integer id;
String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
}
执行结果：
User{id=11, name='user_1'}
User{id=12, name='user_2'}
User{id=13, name='user_3'}
User{id=14, name='user_4'}
User{id=15, name='user_5'}
User{id=16, name='user_6'}
User{id=17, name='user_7'}
User{id=18, name='user_8'}
User{id=19, name='user_9'}
User{id=20, name='user_10'}
Map的forEach
public class HelloWorld {
public static void main(String[] args) {
Map<Integer, User> map = new HashMap<>(10);
for(int i=1;i<=10;i++) {
map.put(i, new User(i, "user_" + i));
}
//map forEach
map.forEach((k, v) -> {
System.out.println("key: " + k + ", value:" + v);
});
}
private static class User{
public User(Integer id, String name) {
this.id = id;
this.name = name;
}
Integer id;
String name;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
}
执行结果：
key: 1, value:User{id=1, name='user_1'}
key: 2, value:User{id=2, name='user_2'}
key: 3, value:User{id=3, name='user_3'}
key: 4, value:User{id=4, name='user_4'}
key: 5, value:User{id=5, name='user_5'}
key: 6, value:User{id=6, name='user_6'}
key: 7, value:User{id=7, name='user_7'}
key: 8, value:User{id=8, name='user_8'}
key: 9, value:User{id=9, name='user_9'}
key: 10, value:User{id=10, name='user_10'}