小编Jon*_*Jon的帖子

有没有办法从两个中创建一个数组？例如

int[] array1 = {1,2,3};
int[] array2 = {4,5,6};
int[] array1and2 = array1 + array2;

我试图检查添加以下约束,但Oracle返回如下所示的错误.

ALTER TABLE Table1
ADD (CONSTRAINT GT_Table1_CloseDate
CHECK (CloseDate > SYSDATE),
CONSTRAINT LT_Table1_CloseDate
CHECK (CloseDate <= SYSDATE + 365)),
CONSTRAINT GT_Table1_StartDate
CHECK (StartDate > (CloseDate + (SYSDATE + 730))));

错误:

Error report:
SQL Error: ORA-02436: date or system variable wrongly specified in CHECK constraint
02436. 00000 -  "date or system variable wrongly specified in CHECK constraint"
*Cause:    An attempt was made to use a date constant or system variable,
           such as USER, in a check constraint that was not completely …

有没有办法在链接列表中切换两个元素而不删除并重新插入它们？我目前使用的代码是:

void exchange(int i, int j) {
    int[] temp = matrix.get(i);
    matrix.remove(i);
    matrix.add(i, matrix.get(j - 1));
    matrix.remove(j);
    matrix.add(j, temp);
}

matrix我的链表在哪里

我试图将多个命令组合成一个输出.

#!/bin/bash

x=$(date +%Y)
x=$($x date +m%)

echo "$x"

这回来了

./test.sh:line 4:2011:命令未找到

当我使用下面的代码时它根本不会改变大小,它仍然填充网格中的区域.

JPanel displayPanel = new JPanel(new GridLayout(4, 2));

JTextField titleText = new JTextField("title");

displayPanel.add(titleText);

titleText.setSize(200, 24);

是否可以在Prolog中保存变量？

我想在程序运行时保存并编辑列表,但无论如何我都找不到在编辑之间保存列表.