如何Function构建二维数组？

[qfengthree]

使用trident-java中

1. Function1: methodName(address[] path) returns (uint256)
   可以用这样构建：
   DynamicArray dynamicArrayPath = new DynamicArray(Address.class, pathList);
2. methodName2(address[][] path) returns (uint256)
   请教一下methodName2，如何构建二维数组？

[endiaoekoe]

hi @qfengthree
you can try this, as below:

   ```
    // Construct a two-dimensional array of addresses
    Address[][] twoDimensionalPath = new Address[][] {
        {new Address("0x123"), new Address("0x456")},
        {new Address("0x789"), new Address("0xabc")}
    };

    // Building two-dimensional arrays with DynamicArray
    DynamicArray dynamicArrayPath = new DynamicArray(Address.class, twoDimensionalPath);

    // invoke methodName2 method
    uint256 result = methodName2(dynamicArrayPath);

[endiaoekoe]

@qfengthree
I just checked the source code of DynamicArray.java, only public constructors can be used,

  public DynamicArray(Class<T> type, List<T> values) {
        super(type, values);
    }

guess you want to construct a Function object, like this

final Function function =
              new Function(
                      "addParticipants",
                      Arrays.asList(
                              new DynamicArray<>(
                                      Bytes32.class, Utils.typeMap(participants, Bytes32.class))),
                      Collections.emptyList());

if you insist on using two-d arrays, I suggest you transform the 2-D arrays to a 2-D List Object, then pass to the constructor function.
which may be like this,

    int[][] twoDimensionalArray = {
            {1, 2, 3},
            {4, 5, 6},
            {7, 8, 9}
        };
        List<List<Integer>> twoDimensionalList = Arrays.stream(twoDimensionalArray)
                .map(row -> Arrays.stream(row).boxed().collect(Collectors.toList()))
                .collect(Collectors.toList());

hope it helps.

[endiaoekoe]

AbiTypes

that's right. currently, it can not use 2-D array as parameters when constructing function. you can only pass limited types， eg: Uint256, Address, and BigInteger.

[endiaoekoe]

@qfengthree

line ’Utils.typeMap(paths, DynamicArray.class, Address.class)‘ which should return a list contains two DynamicArray object.

so

DynamicArray _versionLens = new DynamicArray<>(Uint256.class, Utils.typeMap(versionLens, DynamicArray.class, Uint256.class));
should be
DynamicArray _versionLens = new DynamicArray<>(DynamicArray.class, Utils.typeMap(versionLens, DynamicArray.class, Uint256.class));
same for other lines.

but I just debug your code in my local machine,when encode the DynamicArray(which contains a list have 2 DynamicArray object),form a nested loops。and the output is wrong and be different from your result running with js.

[qfengthree]

已经解决了，参考同步更新web3j