查找2个数组的最大长度

Question

I am passing 2 arrays to the controller with different lengths, I want to execute a for loop and length of that will be the max of the length of 2 arrays. I am not getting how to execute that. I tried Math.max but its giving me error as cannot assign a value to the final variable length.

String[] x =0;
x.length = Math.max(y.length,z.length);
for(int i=0; i < x.length; i++)

The no of elements in x and y are not fixed. it changes what we are passing from the front end.

Answer 1

Initialize the new array with the desired length:

String[] x = new String[Math.max(y.length,z.length)];

In case you don't need to create an array, just use the result of Math.max as conditional to stop your loop:

for (int i = 0; i < Math.max(y.length,z.length); i++) {
    //...
}

Answer 2

Just bring your Math.max() operation into the array's initialization.

String[] x = new String[Math.max(y.length, z.length)];

Here's an expansion for clarity:

int xLength = Math.max(y.length, z.length);
String[] x = new String[xLength];

---

Edit: Unless, OP, you're not interested in creating another array...

I want to execute a for loop and length of that will be the max of the length of 2 arrays

Just bring your Math.max() operation into your for loop:

for(int i=0; i < Math.max(y.length, z.length); i++){
    //code here
}

Answer 3

int max_length = Math.max(y.length,z.length);

for(int i=0; i < max_length ; i++){
 //...
}

you can use that max_length to create a new String[] if you are trying to create an array with total length of y and z arrays , like

String[] newArray = new String[max_length];

Answer 4

Set a variable to the maximum length of the arrays, create a new array with that length and then loop until that point.

int maxLen = Math.max(y.length, x.length);
String[] array = new String[maxLen];
for(int i = 0; i < maxLen; i++){
    // Loop code here
}