jdk8的特性stream().map() 将对象转换成另一个对象
## list对象的转换
对象Staff
```
public class Staff {
private String name;
private int age;
private BigDecimal salary;
}
```
对象StaffPublic
```
public class StaffPublic {
private String name;
private int age;
private String extra;
}
```
对象Staf
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