null line
零线
常用释义
英式发音
美式发音
基本释义
- 零线；零向量线：在二次型的几何学中，指一条线，对于该线上任意两点之间的位移向量应用二次型后结果为零。
例句
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1·If not NULL, increment the line counter.如果不是NULL，则增加行计数器。
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2·The cure for object loitering in this case is to null out the reference after popping it from the stack, as shown in the commented-out line of code in Listing 3.修复这种情况下的对象游离的方法是，当对象从堆栈弹出之后，就消除它的引用，如清单3中注释掉的行所示。
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3·Listing 8 lists the code that was modified in the source of the jfs_mount.c file to create a segmentation fault at line 109 by creating a null pointer exception.清单8列出了jfs_mount . c文件的源代码中被修改过的代码，我们在代码中创建了一个空指针异常，从而使代码在第109行产生段错误。
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4·The NOT NULL attribute of column Credit_Line in table ACCOUNT has to be dropped because some other account types have been added that do not have a credit line.ACCOUNT 表中的 Credit_Line 列的 NOT NULL 属性必须删除，这是因为添加了没有信用行的其他账号类型。
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5·In this example, if the Map on line 1 does not contain the person named "Bob," a null pointer exception will result on line 5 when the person is asked for his name.在这个例子中，如果第1行的Map不包括一个名为“bob”的人，那么在第5行询问person的名字时就会出现null指针异常。
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6·If this method returns void, no change is needed, but if it returns DataObject, change the last line from return null; to return input;.如果这个方法返回void，则不需要任何更改；如果返回DataObject，则将最后一行从return null；更改为return input；。
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7·Because FindBugs doesn't know if the map contains "Bob" or not, it will flag line 5 as a possible null pointer exception.因为FindBugs不知道map是否包含“bob”，所以它将第5行标记为可能null指针异常。
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8·A serial line (null-modem cable) connects the machines through their serial ports.一条串行线(空调制解调器电缆)将通过机器的串口连接它们。
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9·Therefore, if the collector runs before line //2 attaches a strong reference to the re-created object, the object is lost and wr.get() returns null.因此，如果收集器在行 //2 在重新创建的对象上施加一个强引用之前运行，对象就会丢失， wr.get() 则返回 null 。
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10·Line 7 gets the session key from the session if it's already present, else it would be null.如果会话已存在，第7行代码将从会话中获取会话键，否则它将为null。