System.arraycopy--findbugs检查引发的更改-优快云博客

本文介绍了一个表格模型类的设计，该类通过深拷贝来确保外部不可修改其内部存储的数据和列名，从而保障了数据的安全性和完整性。

EI2:
This code stores a reference to an externally mutable object into the internal representation of the object. If instances are accessed by untrusted code, and unchecked changes to the mutable object would compromise security or other important properties, you will need to do something different. Storing a copy of the object is better approach in many situations.

import java.io.Serializable;

public class TableModel implements Serializable {
    private static final long serialVersionUID = 6121579860453189567L;
    private String[][] data;
    private String[] columnNames;

    public TableModel(String[][] data, String[] columnNames) {
        this.data = new String[data.length][];
        System.arraycopy(data, 0, this.data, 0, data.length);
        this.columnNames = new String[columnNames.length];
        System.arraycopy(columnNames, 0, this.columnNames, 0, columnNames.length);
    }

    public void travel() {
        System.out.println(this.data == null);
        System.out.println(this.columnNames == null);
    }

    public static void main(String[] args) {
        String[][] data = {{"A1", "B1"}, {"A2", "B2"}, {"A3", "B3"}, {"A4", "B4"},};
        String[] columnNames = {"COL1", "COL2"};
        TableModel tableModel = new TableModel(data, columnNames);
        tableModel.travel();
    }

}