Java中JDK1.8lambda怎么用

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具体代码如下所示：

public class Student {  private String id;  private String name;  private String age;  private String address;  public Student(String id, String name, String age, String address) {    this.id = id;    this.name = name;    this.age = age;    this.address = address;  }  public String getId() {    return id;  }  public void setId(String id) {    this.id = id;  }  public String getName() {    return name;  }  public void setName(String name) {    this.name = name;  }  public String getAge() {    return age;  }  public void setAge(String age) {    this.age = age;  }  public String getAddress() {    return address;  }  public void setAddress(String address) {    this.address = address;  }  @Override  public String toString() {    return "Student{" +        "id='" + id + '\'' +        ", name='" + name + '\'' +        ", age='" + age + '\'' +        ", address='" + address + '\'' +        '}';  }}public class TestStrean {  public static void main(String[] args){    Student stuA = new Student("1", "A", "M", "184");    Student stuB = new Student("2", "B", "G", "163");    Student stuC = new Student("3", "C", "M", "175");    Student stuD = new Student("4", "D", "G", "158");    Student stuE = new Student("5", "E", "M", "175");    List list = new ArrayList<>();    list.add(stuA);    list.add(stuB);    list.add(stuC);    list.add(stuD);    list.add(stuE);    /*-----------forEach-----------------------*///    list.forEach(item -> item.setId(item.getAddress()+"test") );    /*-----------filter-----------------------*///    List newList=list.stream().filter(item -> item.getAge().contains("G")).collect(Collectors.toList());    /*-----------filter的复杂应用-----------------------*///    list.stream().filter(new Predicate(){////      @Override//      public boolean test(Student student) {//        if(student.getName() !=null){//          return student.getName().contains("30");//        }else{//          return true;//        }//      }//    }).collect(Collectors.toList());    /*-----------分页-----------------------*///    List newList=list.stream().skip(4).limit(3).collect(Collectors.toList());     /*-----------map 返回一个新的list