主要的三种语法格式：
注意：
若Lambda参数列表中的第一参数是 实例方法的调用者，而第二个参数是 实例方法的参数时，可以使用ClassName::method
public class Employee {
private String name;
private int age;
private double salary;
public Employee() {
super();
}
public Employee(int age){
this.age = age;
}
public Employee(String name, int age, double salary) {
super();
this.name = name;
this.age = age;
this.salary = salary;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
@Override
public String toString() {
return "Employee{" +
"name='" + name + '\'' +
", age=" + age +
", salary=" + salary +
'}';
}
}//对象::实例方法名
@Test
public void test1(){
PrintStream ps1 = System.out;
Consumer con = (x) -> ps1.println(x);
PrintStream ps = System.out;
Consumer con1 = ps::println;
Consumer con2 = System.out::println;
con2.accept("abcdef");
}
@Test
public void test2(){
Employee employee = new Employee();
Supplier sup = () -> employee.getName();
String str = sup.get();
System.out.println(str);
Supplier sup2 = employee::getName;
String str2 = sup2.get();
System.out.println(str2);
} //类：静态方法名
@Test
public void test3(){
Comparator com = (x, y) -> Integer.compare(x, y);
Comparator com1 = Integer::compare;
} 格式：ClassName::new
注意：需要调用的构造器的参数列表要与函数式接口中抽象方法的参数列表保持一致
public class Employee {
private String name;
private int age;
private double salary;
public Employee() {
super();
}
public Employee(int age){
this.age = age;
}
public Employee(String name, int age, double salary) {
super();
this.name = name;
this.age = age;
this.salary = salary;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public double getSalary() {
return salary;
}
public void setSalary(double salary) {
this.salary = salary;
}
@Override
public String toString() {
return "Employee{" +
"name='" + name + '\'' +
", age=" + age +
", salary=" + salary +
'}';
}
}//构造器引用
@Test
public void test5(){
Supplier sup = () -> new Employee();
//构造器引用方式
Supplier sup2 = Employee::new;
Employee employee = sup2.get();
System.out.println(employee);
}
@Test
public void test6(){
Function fun = (x) -> new Employee(x);
Function fun2 = Employee::new;
Employee emp = fun2.apply(101);
System.out.println(emp);
} 格式：Type[ ]::new;
//数组引用
@Test
public void test7(){
Function fun = (x) -> new String[x];
String[] strs = fun.apply(10);
System.out.println(strs.length);
Function fun2 = String[]::new;
String[] strs2 = fun2.apply(20);
System.out.println(strs2.length);
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