One of JAVA-reference data types (array)

One, the array

1.1. Definition:

The arrays are of the same data typeMultiple data containers。

1.2. Create format:

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Common formats of commonly used arrays

Format 1. Data type [] Array name = {array content 1, array content 2, array content 3...array content n};

public static void main(String[] args) {
    
    	
		// 格式1:数组类型[] 数组名称 = {数据1,数据2,......,数据n};
		// 创建数组的同时，并创建数组的内容
		int[] student_score1 = {
    
     90, 50, 80, 60, 70, 60 };		
	}

Format 2. Data type [] Array name = new data type [array length];

public static void main(String[] args) {
    
    	
		// 格式2:数组类型[] 数组名称 = new 数组类型[数组长度]; 
		// 创建数组，并指定长度，不指定数组里面的内容	
		int[] student_score2 = new int[6];		
	}

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Uncommon array creation format

Format 3. Data type [] array name;

public static void main(String[] args) {
    
    	
		// 格式3:数组类型[] 数组名称; 
		// 创建数组不初始化
		int[] student_score3;
		student_score3 = new int[6];//但需要new来初始化		
	}

Format 4. Data type [] Array name = new data type [] {content 1, content 2, content 3...content n};

public static void main(String[] args) {
    
    	
		// 格式4:数据类型[] 数组名称 = new 数据类型[]{数据1,数据2,......,数据n};
		int[] student_score4 = new int[] {
    
    80,70,88,66,99,100};		
	}

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1.3, array length acquisition

Array name.length

public static void main(String[] args) {
    
    	
		// 格式4:数据类型[] 数组名称 = new 数据类型[]{数据1,数据2,......,数据n};
		int[] student_score4 = new int[] {
    
    80,70,88,66,99,100};	
		System.out.println(student_score4 .length);
	}

result:

6

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to sum up:

Some common creation formats for arrays are summarized here. If you have any questions, please leave a comment.

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