update stream

CodeCoderCoding · CodeCoderCoding · commit a346df811f2c · 2023-02-13T18:45:14.000+08:00
diff --git a/src/FDynamic/Stream/StreamIntermediateAPI.java b/src/FDynamic/Stream/StreamIntermediateAPI.java
@@ -15,27 +15,40 @@ public static void main(String[] args) {
         );
         filter(personList);
         distinct(personList);
+        map(personList);
     }
 
+    //过滤出符合条件，person的age>18的人
     public static void filter(List<Person> personList){
         List<Person> list=personList.stream()
                 .filter(person->person.getAge()>18)
                 .collect(Collectors.toList());
         printList("filter:", list);
     }
 
+    //过滤不同的人
     public static void distinct(List<Person> personList){
         List<Person> list=personList.stream()
                 .distinct()
                 .collect(Collectors.toList());
         printList("distinct:", list);
     }
 
+    // 使用map，将List<Person>转换为person的名字List<String>
+    public static void map(List<Person> personList){
+        List<String> list=personList.stream()
+                .map(Person::getName)
+                .collect(Collectors.toList());
+        System.out.println("map: "+list);
+    }
+
+    // 打印personList中的内容
     public static void printList(String flag, List<Person> personList){
         System.out.println(flag);
         for(Person person:personList){
             System.out.println(person);
         }
+        System.out.println();
     }
 
 }
diff --git a/src/FDynamic/Stream/StreamTerminalAPI.java b/src/FDynamic/Stream/StreamTerminalAPI.java
@@ -16,6 +16,7 @@ public static void main(String[] args) {
         max(personList);
     }
 
+    //找到年龄最大的人
     public static void max(List<Person> personList){
         Person person=personList.stream()
                 .max(Comparator.comparing(Person::getAge))

Original file line number	Diff line number	Diff line change
`@@ -16,6 +16,7 @@ public static void main(String[] args) {`
`16`	`16`	`max(personList);`
`17`	`17`	`}`
`18`	`18`
	`19`	`+ //找到年龄最大的人`
`19`	`20`	`public static void max(List<Person> personList){`
`20`	`21`	`Person person=personList.stream()`
`21`	`22`	`.max(Comparator.comparing(Person::getAge))`