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String[][] str = {{"1","2","3",},{"4","5","6"},{"7","8","9"}};
float[][] array = new float[str.length][];
for(int i = 0 ; i< str.length;i++){
array[i] = new float[str[i].length];
for(int j = 0; j < str[i].length;j++){
array[i][j] = Float.valueOf(str[i][j]);
}
}