2020-10-21

java 8的新特性之一就是lambda表达式，parallelStream()都说性能会比较高

import lombok.Data;

@Data
public class Bean {

    private int num1;
    private int num2;

    public Bean(int num1, int num2){
        this.num1 = num1;
        this.num2 = num2;
    }

}

public static void main(String[] args) {
        Bean bean1 = new Bean(1, 2);
        Bean bean2 = new Bean(3,4);
        List<Bean> list = Lists.newArrayList(bean1, bean2);
        System.out.println(list);
        list.stream().filter(bean -> {
            if (1 == bean.getNum1()){
                bean.setNum1(2);
            }
            return true;
        }).collect(Collectors.toList());
        System.out.println(list);
    }

测试结果如下：

[Bean(num1=1, num2=2), Bean(num1=3, num2=4)]
[Bean(num1=2, num2=2), Bean(num1=3, num2=4)]