LinkedHashSet 去重

@Override
public int hashCode() {
    return this.getDeviceid().hashCode() + this.getTerminalcode().hashCode();
}

@Override
public boolean equals(Object obj) {
    DevicePostmanPackColumnConfig obj1 = (DevicePostmanPackColumnConfig) obj;
    if (obj1.getDeviceid().equals(this.getDeviceid())&&obj1.getTerminalcode().equals(this.terminalcode)){
        return true;
    }
    return false;
}

for (int i = 0; i < 3; i++) {
    DevicePostmanPackColumnConfig configEntity = new DevicePostmanPackColumnConfig();
    configEntity.setDeviceid(1L);
    configEntity.setTerminalcode("bb");
    list.add(configEntity);
}