NumMatrix (leetcode-in-java 1.5 API)

java.lang.Object
- g0301_0400.s0304_range_sum_query_2d_immutable.NumMatrix

```
public class NumMatrix
extends Object
```

- Constructor Summary
  
  Constructors
  Constructor Description
  
  NumMatrix(int[][] matrix)
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  int sumRegion(int row1, int col1, int row2, int col2)
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- NumMatrix
```
public NumMatrix(int[][] matrix)
```

Method Detail

sumRegion

public int sumRegion(int row1,
                     int col1,
                     int row2,
                     int col2)