How to fill an array with variable parameter list in java

1. Description

Use a variable parameter list, no need to write array syntax explicitly, the compiler will fill the array. Canbe applied to situations where the number or type of parameters is unknown.

2. Example

When themethod parameteris a variable parameter list, you can pass a group of things as a list. If there is already a Array, this method can also accept it as a variadic argument list, in which case the compiler will not perform any conversion. At the same time, the variable parameter list can also pass no parameters, which is useful for scenarios with optional trailing parameters.

public class MyVarArgs { public static void main(String[] args) { printArray(1, 1.1F, 12.11); printArray("one", "two", "three", "four"); printArray(new MyVarArgs(), new MyVarArgs()); //数组作为参数 Integer[] arr = new Integer[]{1,2,3,4}; printArray((Object[]) arr); //参数为空 printArray(); } public static void printArray(Object... args){ for (Object obj : args){ System.out.print(obj + " "); } System.out.println(); } } /* 输出 1 1.1 12.11 one two three four MyVarArgs@1b6d3586 MyVarArgs@4554617c 1 2 3 4 */

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