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public static void main(String[] args) {
String[][] a = {
{"货品编号1","数量20","数量15","数量18"},
{"货品编号2","数量48","数量30","数量27"}
};
String[][] b = {
{"货品编号1","数量40","数量25","数量36"},
{"货品编号2","数量20","数量17","数量73","数量14","数量22"}
};
int length = a.length>b.length?a.length:b.length;
String[][] c = new String[length][];
for(int i=0;i<length;i++){
c[i] = new String[i<a.length?(i<b.length?Math.max(b[i].length, a[i].length):a[i].length):b[i].length];
for(int j=0;j<c[i].length;j++){
c[i][j] = j==0?"货品编号"+(i+1):j<a[i].length?j<b[i].length?"数量"+(Integer.parseInt(a[i][j].substring(2))+Integer.parseInt(b[i][j].substring(2))):"数量"+(Integer.parseInt(a[i][j].substring(2))):"数量"+(Integer.parseInt(b[i][j].substring(2)));
}
}
for(int n=0;n<c.length;n++){
for(int m=0;m<c[n].length;m++){
System.out.print(c[n][m]+",");
}
System.out.println();
}
}