Creation and Parameter Passing Methods of Arrays in Java (Learning Summary)

(1) Array Creation

The creation of an array includes two parts: the declaration of the array and the allocation of memory space.

int score[]=null; //Declare a one-dimensional array
score=new int[3}; //allocated with a length of3space

There is another way to declare an array:

int[] score=null; //Write the square brackets in front of the array name

Usually, to make it convenient when writing code, we merge the two lines into one line:

int score[]=new int score[3}; //Write the declaration and memory allocation of the array in one line

(II) Parameter Passing

Since we are beginners in Java, we will only discuss value passing here and not address passing. The main points are3Point:

· The actual parameter is the array name;

· The formal parameter is the newly declared array. If there is a return value, add square brackets "[]" after the function type;

· The return value is the array name.

Example:

/**
* Created by lijiaman on 2016/9/16.
*/
public class createArray2
{
public static void main(String[] args)
{
int score[]=null;
score=new int[3};
int speed[]={12,35};
for(int x=0;x<3;x++)
{
score[x]=x*2+1;
}
for(int x=0;x<3;x++)
{
System.out.println("score["+x+"]="+score[x]);
}
System.out.println("length:");+score.length);
for(int x=0;x<speed.length;x++)
{
System.out.println("Speed:");+speed);
}
}
}

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