The Array in JAVA

We can define an array by this way
it's a dynamic array,which is needed to be assigned

int num[] = new num[30];

we can access it by this way

num[0] = 10;  // The first value of this array

num[1] = 11; // The second value of this array

we can output them by this way

System.out.println("num[0] = " + num[0]);

This is a static array

String stu[] = new String[]{"Jack","Marry","Bob"};

We can get its numbers(个数) by this way

System.out.println("The numbers of this array are:" + num.length);

typical definations

String[] stu = new String[]{"Jack","Marry",‘Bob"’};

invoke an array

a.

for(int i = 0; i < array.length; i++)
Systm.out.println(array[i]);

b.增强for循环

The system will acquire each valus of the arr2 and assign it to arr1,until every value is output.

for (String arr1 : arr2)
System.out.println(arr1);