Java 扫描二维数组中的下一个空值并替换行中的值
因此,基本上,我需要搜索索引的下一个空值(指定为0),并用各种信息替换整行。例如,如果第三行中有一个空白元素,它将不是“0,0,0,0”,而是“(行号),a,b,c”。这就是我到目前为止所做的,我只是得到了一长串运行时错误Java 扫描二维数组中的下一个空值并替换行中的值,java,arrays,multidimensional-array,nested-loops,Java,Arrays,Multidimensional Array,Nested Loops,因此,基本上,我需要搜索索引的下一个空值(指定为0),并用各种信息替换整行。例如,如果第三行中有一个空白元素,它将不是“0,0,0,0”,而是“(行号),a,b,c”。这就是我到目前为止所做的,我只是得到了一长串运行时错误 String[][] clientsArray = new String[20][4]; int rows = 20; int columns = 4; for (int r = 0; r < rows ; r++ ) { for (int c
String[][] clientsArray = new String[20][4];
int rows = 20;
int columns = 4;
for (int r = 0; r < rows ; r++ )
{
for (int c = 0; c < columns ; c++ )
{
if (clientsArray[r][c].equals ("0"))
{
String key = Integer.toString(r);
clientsArray[r][0] = key;
clientsArray[r][0+1] = "a"
clientsArray[r][0+2] = "b"
clientsArray[r][0+3] = "c"
break;
}
}
}
String[][]clientsArray=新字符串[20][4];
int行=20;
int列=4;
对于(int r=0;r
目前,整个2d数组都充满了“0”,我只是没有包括这部分代码
**注意:我已将“c”值更改为0,从注释判断,您希望:
String[][] clientsArray = new String[20][4];
int rows = 20; // this can also be clientsArray.length
int columns = 4; // this can also be clientsArray[0].length
for (int r = 0; r < rows ; r++ )
{
//since you are only looking at the 1st column, you don't need the inner loop
// this makes sure that the spot in the 2d array is set, otherwise trying to call .equals will crash your program.
if (clientsArray[r][0] == null || clientsArray[r][0].equals ("0"))
{
String key = Integer.toString(r);
clientsArray[r][0] = key;
clientsArray[r][1] = "a"
clientsArray[r][2] = "b"
clientsArray[r][3] = "c" //you don't need the 0+, if you wanted to have a 2d array with more then 4 rows, you could put a for loop here insead of doing it 4 times like you did here
break; //if you wanted to find ALL empty rows take this out.
//also note if you have 2 loops like in your question, if would only break out of the 1st one
}
}
String[][]clientsArray=新字符串[20][4];
int行=20;//这也可以是clientsArray.length
int columns=4;//这也可以是clientsArray[0]。长度
对于(int r=0;r
对于初学者来说,实际上有20行,每行有4列。至少是您声明
clientsArray
的方式。当你修正这个问题时,如果c
不是零,你认为当你使用例如c+3
作为索引时会发生什么?这就是我想要的。当它搜索以0开头的行时,它会将该行的第一列替换为行号,然后将第二列替换为“a”,第三列替换为“b”,第四列替换为“c”,因为您不需要内部loop.omg。这简直要了我的命。干杯,伙计