java将一维数组拆分成二维数组

package staticFactory;

public class Array {
	public static void main(String[] args) {
		String[] a=new String[3];
		String[][] b=new String[a.length][];
		a[0]=">=,80,20";
		a[1]="<,80,15";
		a[2]="<,50,5";
		for(int i=0;i<a.length;i++){
			b[i]=a[i].split(",");
		}
		for(int i=0;i<b.length;i++){
			for(int j=0;j<b[i].length;j++){
				System.out.print(b[i][j]+" ");
			}
			System.out.println("\n");
		}
	}

}

>= 80 20 

< 80 15 

< 50 5