title Journey of Creating and Initializing a String Array in Java section Declare Array Create_Variable("Declare String Array Variable") section Initialize Array Create_Array("Initialize String Array") section
publicclassStringArrayExample{publicstaticvoidmain(String[]args){// 声明一个字符串数组,大小为5String[]fruits=newString[5];// 将元素存储到数组中fruits[0]="apple";fruits[1]="banana";fruits[2]="orange";fruits[3]="grape";fruits[4]="watermelon";// 打印数组中的元素for(Stringfruit:fruits){...
ArrayList实例也可以通过其它方式初始化。例如,可以给ArrayList构造器提供一个数组,或者在编译过程中知道初始元素时也可以使用List.of()和array.aslist()方法。我发现自己并不经常使用这些方式,因为我对ArrayList的主要用途是当我只想读取一次数据时。 此外,对于那些喜欢在加载数据后使用数组的人,可以使用ArrayList的toArr...
Declaring and Initializing a String array As previously mentioned, an array can be initialized in multiple ways. The following example demonstrates how a string type array can be declared and initialized using elements in individual indexes: String countries [] =newString[5]; countries [0] = "US...
public void testEnumMap(PrintStream out) throws IOException { // Create a map with the key and a String message EnumMap<AntStatus, String> antMessages = new EnumMap<AntStatus, String>(AntStatus.class); // Initialize the map antMessages.put(AntStatus.INITIALIZING, "Initializing Ant..."); ...
AClass[]array;...array={object1,object2}; 21.“ArrayIndexOutOfBoundsException” 这是在代码尝试访问不在值内的数组索引时发生的运行时错误消息。以下代码将触发此异常: String[] name = { "tom", "dick", "harry" }; for(inti = 0; i <= name.length; i++) { ...
Here’s an example of initializing an ArrayList using the Stream API: ArrayList<String>names=Stream.of("John","Alice").collect(Collectors.toCollection(ArrayList::new));System.out.println(names);#Output:#[John,Alice] Java Copy In this example,Stream.of("John", "Alice")creates a new stream...
Initializing Variables 76 Constants 76 Operators 77 Increment and Decrement Operators 78 Relational and boolean Operators 79 Bitwise Operators 81 Mathematical Functions and Constants 81 Conversions between Numeric Types 83 Casts 84 Parentheses and Operator Hierarchy 84 Enumerated Types 85 Strings 86 Sub...
classTestarray3 {publicstaticvoidmain(String args[]) {//declaring and initializing 2D arrayintarr[][] = { { 1, 2, 3 }, { 2, 4, 5 }, { 4, 4, 5} };//printing 2D arrayfor(inti = 0; i < 3; i++) {for(intj = 0; j < 3; j++) { ...
1. Initializing Array at Time of Declaration Declaring and initializing an array in a single statement (array initializer) is a good idea if: We know the array of items in advance Array size is small Stringstatus[]=newString[]{"Active","Inactive","Purged"}; ...