/
SymmetricMatrix.java
56 lines (46 loc) · 1.48 KB
/
SymmetricMatrix.java
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package github.clyoudu.matrix;
import github.clyoudu.list.ArrayList;
import github.clyoudu.list.List;
import org.apache.commons.lang3.StringUtils;
/**
* Create by IntelliJ IDEA
*
* @Author chenlei
* @DateTime 2018/5/15 17:38
* @Description SymmetricMatrix
*/
public class SymmetricMatrix<T> implements Matrix<T> {
Object[] data;
@Override
public void init(T[][] data) {
int length = data.length * (data.length + 1) / 2;
this.data = new Object[length];
int index = 0;
for (int i = 0; i < data.length; i++) {
for (int j = 0; j < data[i].length; j++) {
if(i >= j){
T element = data[i][j];
if(element != null && ((Number)element).doubleValue() != 0D){
this.data[index ++] = element;
}
}
}
}
}
@Override
public void print() {
List<String> rows = new ArrayList<>();
int n = new Double(Math.sqrt(2D * data.length + 1 / 4) - 1 / 2).intValue();
for (int i = 0; i < n; i++) {
List<T> row = new ArrayList<>();
for (int j = 0; j < n; j++) {
int max = Math.max(i,j);
int min = Math.min(i,j);
int index = max * (max + 1) / 2 + min;
row.add((T) data[index]);
}
rows.add(StringUtils.join(row," "));
}
System.out.println(StringUtils.join(rows,"\n"));
}
}