{ return first; } public B getSecond() { return second; } public C getThird() { return third; } } public static Tuple<String, Integer, Double> getMultipleObjects() { return new Tuple<>("Hello", 42, 3.14); } public static void main(String[] args) { Tuple<String, Integer, Double...
1.Objects.checkFromIndexSize(intfromIndex,intsize,intlength) inta= Objects.checkFromIndexSize(4, 8, 12); System.out.println(a); 结果为:4 inta= Objects.checkFromIndexSize(4, 8, 11); System.out.println(a); 结果为:Range [4, 4 + 8) out of bounds for length 11 检查是否在子范围从fromIn...
import java.util.Objects;public class Person {private String name;private int age;@Override public boolean equals(Object o) { // 如果对象地址一样，则认为相同 if (this == o) return true; // 如果参数为空，或者类型信息不一样，则认为不同 if (o == null || getClass() ...
return false; } final Movie other = (Movie) obj; if (!Objects.equals(this.movieTitle, other.movieTitle)) { return false; } if (this.yearReleased != other.yearReleased) { return false; } if (!Objects.equals(this.movieDirectorName, other.movieDirectorName)) { return false; } if (!Ob...
objects //Objects类的equalspublicstaticbooleanequals(Objecta,Objectb){return(a == b) || (a !=null&& a.equals(b));} 我们可以看到objects类的方法更加的专业 它有非空校验,但是object的方法没有 obj1=null;obj1.equals(obj2); object的比较方式没有校验,如上比较后,会报错: ...
}returnresult; } } 推荐使用Objects.hash(Object… values)方法。相信看源码的时候,都看到计算hashCode都使用了31作为基础乘数, 为什么使用31呢?我比较赞同与理解result * 31 = (result<<5) - result。JVM底层可以自动做优化为位运算,效率很高;还有因为31计算的hashCode冲突较少,利于hash桶位的分布。
@GetMapping("/queryOperateLogs")@ApiOperation("查询指定操作类型的操作日志列表")@ApiImplicitParam(name="operateType",value="操作类型,取值说明: 1,新增;2,更新;3,除;4,查询",dataType="int",paramType="query")publicList<OperateLog>queryOperateLogs(int operateType){returntestService.queryOperateLogs(...
com.javacodegeeks.advanced.objects.Person@6104e2ee 我们来通过重写Person和toString()方法以使其输出更有用,下面是其中一种实例: // Please add the @Override annotation, it will ensure that your // intention is to change the default implementation. @Override public String toString() { return String...
Object intercept(Object o, Method method, Object[] objects, MethodProxy methodProxy) throws Throwable { returnnull; } } 第步不管是哪种代理模式,都不能缺少目标对象,所以在Cglib代理中同样需要依赖目标对象,和JDK代理同样的思想,在构造器初始化目标对象: packagecom.ignorance.cglib; importnet....
package com.bobo.demo.UseObject.UseEquals; import java.util.Objects; public class Student { private String name; private int age; public Student(String name, int age) { this.name = name; this.age = age; } public Student() { } public String getName() { return name; } public void se...